Load video: Multi Back Extension DRE8040

Exercises and muscles targeted

Exercise	Muscles Targeted
Hip Extension — Knee Flexed (glute-dominant)	Gluteus Maximus (primary — hamstrings shortened at flexed knee, glute carries primary load), Erector Spinae (secondary), Gluteus Medius (stabiliser), Hamstrings (reduced contribution due to knee flexion)
Hip Extension — Lower Footplate (greater knee flexion)	Gluteus Maximus (maximum isolation — hamstring contribution further reduced at deeper knee flexion, primary), Erector Spinae (secondary), Gluteus Medius (stabiliser)
Hip Extension — Higher Footplate (less knee flexion)	Gluteus Maximus (primary), Hamstrings (greater contribution as knee approaches extension — Biceps Femoris, Semimembranosus), Erector Spinae (secondary)
Trunk Hinge — Spine Stabilisation Focus	Erector Spinae (Iliocostalis, Longissimus — primary through lumbar extension), Multifidus (deep spinal stabiliser, primary), Gluteus Maximus (secondary), Quadratus Lumborum (stabiliser)
Hip Extension Isometric Hold (peak contraction)	Gluteus Maximus (sustained isometric at full hip extension), Erector Spinae (isometric), Gluteus Medius, Multifidus (stabiliser throughout hold)
Eccentric Hip Extension (controlled lowering)	Gluteus Maximus (eccentric overload — maximum hypertrophy stimulus), Erector Spinae (eccentric), Hamstrings (eccentric at shortened position), Multifidus and Quadratus Lumborum (stabiliser)

The defining mechanical advantage of the DRE8040 is the combination of an adjustable knee flexion angle and a selectorized weight stack. Flexing the knee shortens the hamstrings, which reduces their mechanical contribution to the hip extension drive and concentrates the load on the gluteus maximus. The 6-position footplate and 5-level calf pad allow this flexion angle to be set precisely for each user's goals — from maximum glute isolation at higher flexion settings through to combined posterior chain activation at lower ones. The Dynasty Flex-Stack System delivers a true 1:1 felt weight ratio throughout, so the stack weight translates directly into the movement without the resistance loss that cam-heavy machines introduce.

Who this machine is built for

Serious Home Gym Builders
You train the posterior chain seriously and you want a selectorized machine that covers glute isolation, combined hip extension, and spinal erector work with a single weight stack and fast adjustment between sets. The DRE8040 fits a 49"×44" footprint, uses a single weight stack that adjusts instantly between exercises, and delivers a true 1:1 felt weight ratio through the Dynasty Flex-Stack System — so the resistance you select is the resistance you feel.

Bodybuilders and Physique Athletes
Maximum gluteus maximus isolation volume is a primary goal in competitive glute development programming. The DRE8040 achieves this by exploiting the mechanical disadvantage of the hamstrings at a flexed knee — when the hamstring is shortened it cannot contribute to the extension, leaving the glute as the sole primary driver. The selectorized stack and 1:1 felt weight ratio make progressive overload simple and measurable, and the eccentric lowering phase under a controlled stack load produces the stretch-loaded hypertrophy stimulus that advanced posterior chain programming demands.

Commercial Gym Owners and Operators
The 9-position air-assisted thigh pad and gas spring adjustment system mean the DRE8040 is ready for the next user in seconds without manual wrestling with a stiff mechanism. The 6-position footplate and 5-level calf pad cover every user from shorter to taller athletes without additional accessories. At 485 lbs and a 200 lb standard stack with a 250 lb upgrade available through Dynasty Fitness, the machine stays grounded and delivers serious resistance headroom for a broad commercial membership.

Private Personal Training Studios
The selectorized format and gas-spring assisted adjustments allow a trainer to set up clients of different heights and training goals between sessions with minimal time lost. The footplate position shift between glute-dominant and combined posterior chain sessions gives coaches a meaningful programming variable within a single machine, and the front load handle allows resistance to be increased progressively as clients develop strength in the posterior chain over a training cycle.

University and College Athletic Departments
Posterior chain strength through hip extension is a foundational quality across virtually every team sport. The DRE8040's adjustable knee flexion angle allows S&C coaches to train the gluteus maximus, hamstrings, and erectors with different emphasis settings within the same machine, and the selectorized stack makes load tracking and progression straightforward across a rotating athlete group. The 5-level calf pad also supports the trunk stabilisation work that contributes to athletic bracing patterns.

Physical Therapists and Sports Medicine Practitioners
Hip extension strength with the knee flexed is a component of many posterior chain rehabilitation protocols where isolated glute activation needs to be re-established without the hamstrings compensating. The DRE8040 provides a controlled, machine-guided movement path with precise adjustment across three independent contact points, allowing load to be introduced progressively at the correct joint angles for each stage of a clinical programme. Exercise selection and loading should always follow the clinical programme specific to each patient's condition and recovery stage.

How to setup and use

Setting Up the DRE8040 Multi Back Extension

Select the weight on the stack using the selector pin. Start conservatively for the first session in each footplate configuration to establish the correct body position and movement path before increasing load.
Set the high footplate to one of six positions. A lower footplate position increases knee flexion and concentrates more of the hip extension load on the glutes. A higher position reduces knee flexion and allows greater hamstring contribution alongside the glutes. Start at the middle position for a balanced posterior chain stimulus.
Set the calf pad to the angle that suits the trunk hinge pattern for the session using the 5-level adjustment. A more upright calf pad angle supports spine stabilisation focus. A lower angle increases the hip hinge range and posterior chain stretch.
Use the side handles to mount the machine safely, then position the thighs against the air-assisted thigh pad. Press the gas spring lever with light one-hand pressure to move the pad until it contacts the back of the thigh just above the knee, not at the calf or hip.
Confirm the dual-angle foot platform setting — flat for standard ankle mobility, inclined for users with limited dorsiflexion who need a raised heel position to maintain stable foot contact.
Grip the front load handle firmly before beginning the first rep. Confirm the thigh pad and foot platform contact feel correct through one controlled bodyweight repetition before loading the full working weight.

Performing the Exercise

From the starting position with the hips flexed and the torso angled forward, drive the hips backward and upward by contracting the glutes, keeping the knee in contact with the thigh pad throughout the movement.
Focus the effort on the glutes rather than attempting to straighten the leg. The knee remains in the flexed position set by the footplate, which is what concentrates the load on the gluteus maximus rather than the hamstrings.
Drive to full hip extension at the top of the arc where the body forms a straight line from the knee through the hip to the torso, squeezing the glutes at peak contraction for one to two seconds.
Lower back to the starting position under control over at least two to three seconds, maintaining posterior chain tension through the eccentric return. The Dynasty Flex-Stack System delivers consistent 1:1 resistance through this lowering phase, which is where a significant portion of the hypertrophy stimulus is generated.
Keep both feet pressed firmly into the foot platform and maintain thigh pad contact consistently throughout every rep. If pad contact shifts during the set, stop and reposition before continuing.
After the final rep, use the side handles to dismount safely before the stack settles fully.

Owner's Manual

Access the complete assembly guide, parts list, and maintenance schedule below.

Download Owners Manual

Shipping & Delivery

All Dynasty Fitness equipment ships free across the 48 contiguous US states via freight carrier. If the product description says preorder, we'll send you an estimated delivery date via email.

Estimated delivery: 7–14 business days from order confirmation. You will receive a tracking number and a delivery window confirmation call before your shipment arrives. Deliveries are curbside standard, white glove delivery to room of choice is available at checkout.

Returns: Free within 30 days of delivery. Items must be in original condition and packaging. Refunds processed within 5 business days of return receipt.

Questions? Contact our team at:
📧Email: info@thedynastyfitness.com
📞Call: +1 (213)-584-0858

Need a buying guide?

Looking for one to one support before making final decision?
Feel free to contact us. Our expert support team would love to assist you.

Need Installation Help?

We have partnered with another company to help provide installation around the country. Please use the link below to see the price per machine for installation
See Installation Rates

Payment & Security

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Save 10%

Multi Back Extension DRE8040

$2,649.00

$2,649.00 ~~$2,949.00~~ 10% off (Save$300.00 )

Commercial Grade
Pay With HFA/FSA

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Weight Stack: 210lb

210lb 250lb

The Dynasty Fitness DRE8040 Multi Back Extension is a selectorized posterior chain machine that trains the erector spinae, gluteus maximus, and hamstrings through hip extension and trunk hinge movements with a precision weight stack, delivering the same muscle stimulus as a plate-loaded back extension in a faster, more accessible selectorized format powered by the Dynasty Flex-Stack System for a true 1:1 felt weight ratio throughout every rep. A 9-position air-assisted thigh pad adjusts with minimal hand force via dual gas springs, a 6-position high footplate sets knee flexion angle to shift the balance between glute isolation and combined posterior chain activation, and a 5-level calf pad provides multiple trunk hinge angles for targeted programming across the full posterior chain. The dual-angle foot platform covers both flat and inclined foot positions for different ankle mobility profiles, and a front load handle provides a stable resistance grip for increased training intensity. Built to commercial grade at 49"×44"×63" with a 200 lb standard weight stack and a 250 lb upgrade option available through Dynasty Fitness, the DRE8040 is built for commercial gyms, personal training studios, and serious home gym setups where selectorized posterior chain training with high adjustment precision is a programming priority.

Selectorized posterior chain machine powered by the Dynasty Flex-Stack System delivering a true 1:1 felt weight ratio, so the resistance on the stack translates directly into the movement without the weight loss that cam-based and leverage-heavy machines produce
9-position air-assisted thigh pad adjusts with minimal hand force using dual gas springs, covering the full range of user heights and thigh lengths without the effort that stiff pin-and-bracket systems demand between users in a commercial session
6-position high footplate sets the knee flexion angle precisely, shifting the primary load from combined posterior chain activation at lower flexion toward maximum gluteus maximus isolation at higher flexion — a level of programming specificity that fixed-geometry machines cannot match
5-level calf pad angle adjustment opens the machine to multiple trunk hinge patterns across the full posterior chain, from lumbar-focused spinal stabilisation sets through to lower-body hypertrophy work that targets the glutes and hamstrings independently

Limited time offer

Get 20% off when you order 4 or more pieces of equipment!

Exercises and muscles targeted

Exercise	Muscles Targeted
Hip Extension — Knee Flexed (glute-dominant)	Gluteus Maximus (primary — hamstrings shortened at flexed knee, glute carries primary load), Erector Spinae (secondary), Gluteus Medius (stabiliser), Hamstrings (reduced contribution due to knee flexion)
Hip Extension — Lower Footplate (greater knee flexion)	Gluteus Maximus (maximum isolation — hamstring contribution further reduced at deeper knee flexion, primary), Erector Spinae (secondary), Gluteus Medius (stabiliser)
Hip Extension — Higher Footplate (less knee flexion)	Gluteus Maximus (primary), Hamstrings (greater contribution as knee approaches extension — Biceps Femoris, Semimembranosus), Erector Spinae (secondary)
Trunk Hinge — Spine Stabilisation Focus	Erector Spinae (Iliocostalis, Longissimus — primary through lumbar extension), Multifidus (deep spinal stabiliser, primary), Gluteus Maximus (secondary), Quadratus Lumborum (stabiliser)
Hip Extension Isometric Hold (peak contraction)	Gluteus Maximus (sustained isometric at full hip extension), Erector Spinae (isometric), Gluteus Medius, Multifidus (stabiliser throughout hold)
Eccentric Hip Extension (controlled lowering)	Gluteus Maximus (eccentric overload — maximum hypertrophy stimulus), Erector Spinae (eccentric), Hamstrings (eccentric at shortened position), Multifidus and Quadratus Lumborum (stabiliser)

Who this machine is built for

How to setup and use

Setting Up the DRE8040 Multi Back Extension

Select the weight on the stack using the selector pin. Start conservatively for the first session in each footplate configuration to establish the correct body position and movement path before increasing load.
Set the high footplate to one of six positions. A lower footplate position increases knee flexion and concentrates more of the hip extension load on the glutes. A higher position reduces knee flexion and allows greater hamstring contribution alongside the glutes. Start at the middle position for a balanced posterior chain stimulus.
Set the calf pad to the angle that suits the trunk hinge pattern for the session using the 5-level adjustment. A more upright calf pad angle supports spine stabilisation focus. A lower angle increases the hip hinge range and posterior chain stretch.
Use the side handles to mount the machine safely, then position the thighs against the air-assisted thigh pad. Press the gas spring lever with light one-hand pressure to move the pad until it contacts the back of the thigh just above the knee, not at the calf or hip.
Confirm the dual-angle foot platform setting — flat for standard ankle mobility, inclined for users with limited dorsiflexion who need a raised heel position to maintain stable foot contact.
Grip the front load handle firmly before beginning the first rep. Confirm the thigh pad and foot platform contact feel correct through one controlled bodyweight repetition before loading the full working weight.

Performing the Exercise

From the starting position with the hips flexed and the torso angled forward, drive the hips backward and upward by contracting the glutes, keeping the knee in contact with the thigh pad throughout the movement.
Focus the effort on the glutes rather than attempting to straighten the leg. The knee remains in the flexed position set by the footplate, which is what concentrates the load on the gluteus maximus rather than the hamstrings.
Drive to full hip extension at the top of the arc where the body forms a straight line from the knee through the hip to the torso, squeezing the glutes at peak contraction for one to two seconds.
Lower back to the starting position under control over at least two to three seconds, maintaining posterior chain tension through the eccentric return. The Dynasty Flex-Stack System delivers consistent 1:1 resistance through this lowering phase, which is where a significant portion of the hypertrophy stimulus is generated.
Keep both feet pressed firmly into the foot platform and maintain thigh pad contact consistently throughout every rep. If pad contact shifts during the set, stop and reposition before continuing.
After the final rep, use the side handles to dismount safely before the stack settles fully.

Owner's Manual

Access the complete assembly guide, parts list, and maintenance schedule below.

Download Owners Manual

Shipping & Delivery

All Dynasty Fitness equipment ships free across the 48 contiguous US states via freight carrier. If the product description says preorder, we'll send you an estimated delivery date via email.

Returns: Free within 30 days of delivery. Items must be in original condition and packaging. Refunds processed within 5 business days of return receipt.

Questions? Contact our team at:
📧Email: info@thedynastyfitness.com
📞Call: +1 (213)-584-0858

Need a buying guide?

Looking for one to one support before making final decision?
Feel free to contact us. Our expert support team would love to assist you.

Need Installation Help?

We have partnered with another company to help provide installation around the country. Please use the link below to see the price per machine for installation
See Installation Rates

Payment & Security

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Multi Back Extension DRE8040

$2,649.00

$2,649.00 ~~$2,949.00~~ 10% off (Save$300.00 )

Key Features

Dynasty Flex-Stack System

The DRE8040 runs on the Dynasty Flex-Stack System, which delivers a true 1:1 felt weight ratio between the stack selection and the resistance felt during the movement. Many selectorized back extension machines use cam mechanisms or leverage systems that reduce the felt weight significantly below the selected stack weight, particularly through the mid-range of the movement where the muscle is most active. The Dynasty Flex-Stack System uses a precision pulley arrangement to offset these losses, so the resistance the user selects is the resistance the posterior chain works against through the full extension arc.

9-Position Air-Assisted Thigh Pad

The thigh pad adjusts to nine positions using two gas springs (QD-18-304-20KG each) that reduce the manual force required to reposition the pad to a light one-handed press. In a commercial environment where the thigh pad is adjusted between every user, a stiff pin-and-bracket system creates friction that causes members to skip the adjustment and train in a suboptimal position. The gas spring assistance eliminates that friction, which means the pad gets set correctly for each user every time without slowing the session.

6-Position High Footplate

The elevated footplate adjusts to six height positions to control how much the knee flexes during the hip extension movement. A lower footplate setting increases knee flexion, which shortens the hamstrings and pushes more of the hip extension load onto the gluteus maximus for maximum glute isolation. A higher setting reduces flexion, allowing the hamstrings to contribute more alongside the glutes for a combined posterior chain stimulus. Six positions provide enough granularity to fine-tune this balance rather than choosing between only two or three fixed options.

5-Level Calf Pad

The calf pad adjusts across five angle positions to change the trunk hinge angle available during the exercise. A more upright calf pad position limits the trunk hinge range and keeps the movement focused on lumbar extension and spinal stabilisation. A lower angle extends the hip hinge range and increases the stretch through the posterior chain at the bottom of the movement, which increases the eccentric loading stimulus on the glutes and hamstrings. The five levels allow the machine to serve both spine stabilisation work and posterior chain hypertrophy training from the same station.

Dual-Angle Foot Platform

The foot platform (633×512mm) provides both flat and inclined surface options. The flat position suits users with adequate ankle dorsiflexion who can maintain stable heel contact during the hip extension movement. The inclined surface raises the heel effectively, which accommodates users with limited ankle mobility and allows them to maintain the correct foot position without the heel rising during the movement. Both surfaces carry an anti-slip texture that prevents foot shift during the drive phase under loaded sets.

Back Pads

Two back pads (351×180×100mm each) contact the back of the thighs during the exercise, distributing the hip extension force evenly across the contact surface rather than concentrating it at a pressure point. The 100mm depth provides adequate cushioning under the load generated during heavy selectorized sets while maintaining the positional stability that shallow pads cannot. The pads are positioned at the correct anatomical contact point when the thigh pad height is set correctly, which keeps the force transfer path aligned with the gluteus maximus throughout the arc.

Front Load Handle

A front-mounted grip handle provides a stable upper body brace point during the hip extension drive. The handle keeps the torso anchored and prevents forward drift that would shift effort away from the posterior chain into the arms and shoulders. Grips are DTφ30×φ22×218mm, sized for a firm hold under heavier stack loads where the posterior chain drive creates significant reaction force through the upper body contact points.

Product Information
Product Name	Multi Back Extension
Model	DRE8040
Series	DRE80 Selectorized Series
Product Type	Selectorized Multi Back Extension Machine
Function	Hip extension and trunk hinge — posterior chain development
Target Muscles	Gluteus Maximus (primary), Erector Spinae, Hamstrings (secondary)
Resistance System	Dynasty Flex-Stack System — 1:1 felt weight ratio
Grade	Commercial
Colour	Black
Dimensions and Weight
Length	49 in (124.0 cm)
Width	44 in (112.5 cm)
Height	63 in (160.2 cm)
Net Weight	485 lbs (220 kg)
Weight Stack
Standard Weight Stack	200 lbs
Upgraded Weight Stack	250 lbs — contact Dynasty Fitness
Adjustability
Thigh Pad Positions	9 positions — air-assisted, gas spring QD-18-304-20KG x2
High Footplate Positions	6 positions — sets knee flexion angle
Calf Pad Angle Positions	5 levels — sets trunk hinge angle
Foot Platform	633×512mm dual-angle — flat and inclined, anti-slip surface
Pads, Grips, and Frame
Back Pads	2 x 351×180×100mm
Front Load Grips	DTφ30×φ22×218mm x2
Bearings	6002-2Z x8
Main Frame Tubing	1.97"×5.9"×0.1" rectangular steel
Movement Arm Tubing	Φ2.4"×0.1"
Indoor Use Only	Yes

Q: How is the DRE8040 different from a standard selectorized back extension machine?
A: The DRE8040 adds three independent adjustment axes — thigh pad height, footplate height, and calf pad angle — that a standard back extension machine does not have. A conventional selectorized back extension trains the erector spinae and hamstrings through a fixed geometry that cannot be changed without moving to a different machine. The DRE8040 uses the footplate height to shift primary load between the gluteus maximus and the hamstrings, the calf pad angle to change the trunk hinge range, and the thigh pad to fit any user height precisely — turning what is typically a single-stimulus machine into a full posterior chain training station.

Q: What does the footplate height position change about the exercise?
A: The footplate height controls the degree of knee flexion during the movement. A lower position increases knee flexion, which shortens the hamstrings and reduces their mechanical contribution to the extension — the gluteus maximus carries more of the primary load as a result. A higher position reduces knee flexion, allowing the hamstrings to contribute more alongside the glutes for a combined posterior chain stimulus. Start at the middle position to establish the movement pattern before adjusting toward your training goal.

Q: What is the Dynasty Flex-Stack System and why does it matter on this machine?
A: The Dynasty Flex-Stack System is the internal pulley arrangement that delivers a true 1:1 felt weight ratio between the stack selection and the resistance felt during the movement. Many selectorized machines use cam or leverage systems that reduce the felt weight below the selected stack weight, particularly through the mid-range where the muscle is most active. The Flex-Stack System uses a precision pulley design to offset this loss, so the 200 lb stack on the DRE8040 delivers 200 lbs of genuine felt resistance throughout the full extension arc.

Q: How does the air-assisted thigh pad work?
A: Two gas springs (QD-18-304-20KG each) support the thigh pad frame, which means moving the pad to any of its nine positions requires only light one-hand pressure on the adjustment lever rather than the full manual force that standard pin-and-bracket systems demand. This is a meaningful practical difference in commercial environments where the thigh pad is adjusted multiple times per hour across different users. The pad moves smoothly, locks precisely, and holds position under load without any creep or shift during the set.

Q: Can I use the 250 lb stack upgrade, and how do I order it?
A: Yes. The DRE8040 is available with a 250 lb upgraded weight stack for users who require greater resistance headroom beyond the standard 200 lb configuration. Contact Dynasty Fitness directly to discuss the upgrade option and lead time before placing an order.

Q: What Dynasty Fitness machines pair with the DRE8040 for a complete posterior chain and glute training area?
A: The DRE8040 covers selectorized hip extension with adjustable knee flexion for posterior chain development. Pair it with the Glute Drive DRE8022 for horizontal selectorized hip thrust that trains the gluteus maximus at peak contraction from a different body position and muscle length. The Seated Leg Curl DRE8013 adds selectorized knee flexion for isolated hamstring work that the DRE8040 does not cover. The Standing Rear Kick DRE8032 adds unilateral selectorized glute kickback. Together these four stations cover every major selectorized posterior chain training pattern from a dedicated machine for each.

Commercial Selectorized Machines. Engineered to Perform.

Dynasty Resistance Elite

The Dynasty Resistance Elite is Dynasty Fitness's flagship selectorized series, built around the Dynasty Flex-Stack System that delivers a true 1:1 felt weight ratio across the majority of the lineup. What you select on the stack is exactly what you lift, giving every session accurate, progressive resistance from the first rep to the last.

The series covers the complete commercial training floor. ISO-lateral pressing and pulling machines including the ISO-Lateral Chest Press, ISO-Lateral Shoulder Press, and ISO-Lateral Seated Row train each side of the body independently through its own natural arc, eliminating the compensation that fixed bilateral machines allow. Dedicated lower body stations including the Leg Press/Hack Squat, Leg Curl/Leg Extension and Glute Drive cover compound and isolation lower body training from selectorized stations built for heavy daily volume. A complete cable training ecosystem spans from the Adjustable Cable Crossover and Dual Adjustable Pulley through to the 4-Stack, 5-Stack, and 8-Stack Multi Station systems for facilities that need multiple concurrent training zones.

Every machine is built from heavy-duty commercial steel, finished in matte black, and backed by Dynasty's lifetime frame warranty. This is commercial-grade equipment at a price point that makes it accessible to every serious training environment.

Explore the Elite Series

Commercial Machines, Home Gym Prices

Commercially Engineered, Available to All

OUR COMMITMENT

Every machine that leaves Dynasty Fitness carries the same promise: it is built to the commercial standard that professional training environments demand, priced so that standard is no longer exclusive to them, and backed by the support and warranty coverage that a long-term training investment deserves.

We are committed to equipment that stands the test of time — and to making sure the people who train the hardest have access to the tools that match their effort.