Exercises and muscles targeted

Exercise	Muscles Targeted
Abdominal Crunch (standard seat position)	Rectus Abdominis (full length, primary), Transverse Abdominis (deep compression during crunch, secondary), Hip Flexors - Iliopsoas (minimised by leg support stabilisation), Obliques (secondary)
Oblique Crunch (adjusted seat angle)	External Obliques (primary - targeted through seat angle adjustment), Internal Obliques (primary), Rectus Abdominis (secondary), Transverse Abdominis (stabiliser)
Abdominal Crunch - Isometric Hold	Rectus Abdominis (sustained isometric at mid-range peak contraction), Transverse Abdominis, External and Internal Obliques (co-contraction during sustained hold)
Abdominal Crunch - Slow Eccentric	Rectus Abdominis (eccentric lengthening through full extension, maximum hypertrophy stimulus), Transverse Abdominis (eccentric), Obliques (stabiliser through controlled return)
Abdominal Crunch - Partial ROM (peak arc only)	Rectus Abdominis - Upper and Middle Fibres (inner arc emphasis at peak contraction), Transverse Abdominis (secondary), used for post-failure burnout sets and upper ab definition work

The plate-loaded crunch on the DSH025 applies resistance through the full arc from the stretched starting position through to peak contraction. Floor crunches and sit-ups lose tension at the bottom of the movement where the abdominals are most lengthened and where the primary hypertrophy stimulus would be greatest, because bodyweight provides no resistance at that position. The precision linkage system on the DSH025 applies consistent plate-loaded tension throughout the entire arc including the full stretch position, which is where the largest training stimulus for the rectus abdominis is generated. The three-position seat angle adjustment extends this capability to the obliques, making the DSH025 a complete anterior core training station.

Who this machine is built for

Serious Home Gym Builders
Progressive plate-loaded abdominal training is the only practical way to develop the abdominal thickness and definition that compound training alone cannot produce. The DSH025 uses the same Olympic plates as the rest of your setup and delivers seated crunch training at 661 lbs bilateral capacity in a 48.0" × 44.9" footprint — one of the most compact machines in the DSH series. The three-position seat angle also covers oblique development from the same station, giving complete anterior core coverage without a second machine.

Bodybuilders and Physique Athletes
Abdominal thickness and the distinct separation between ab sections visible in competition conditioning is a function of muscle mass in the rectus abdominis, not just low body fat. Floor crunches and planks maintain muscle tone but do not produce the loading stimulus that grows ab muscle. The DSH025 trains the abs under progressive bilateral plate resistance at any load the training programme demands, with the oblique seat angle adding the lateral core definition that completes the full midsection appearance on stage.

Commercial Gym Owners and Operators
A plate-loaded abdominal crunch machine serves members who train abs seriously and expect to do so with the same progressive resistance principle they apply to every other muscle group. The DSH025's extra-long handles, angled pelvic support pad, and three-position seat angle cover the full range of users from different shoulder widths and mobility levels to different training goals across the rectus abdominis and obliques. The matte black DSH series finish positions it at the premium end of core training equipment on the commercial floor.

Private Personal Training Studios
The three-position seat angle allows a trainer to shift between rectus abdominis and oblique emphasis within a single core training session without changing machines or attachments. The leg support pads and angled pelvic support pad self-position the client correctly without ongoing coaching of lumbar neutral and hip flexor compensation, freeing the trainer to focus entirely on contraction quality, breathing, and rep tempo.

Powerlifters and Strength Athletes
Core strength through progressive abdominal resistance supports the anterior bracing demand of competition deadlifts, squats, and bench press. The DSH025 allows this to be trained with the same progressive overload principle as the competition lifts, building rectus abdominis and oblique strength under plate-loaded bilateral resistance that bodyweight and cable crunch alternatives cannot match at the required load levels.

University and College Athletic Departments
Anterior core strength development through loaded crunch movements contributes to force transfer efficiency across virtually every athletic movement. The DSH025 delivers progressive plate-loaded core training in a controlled machine environment that allows coaches to track and progress core loading alongside the rest of the strength programme, rather than treating core training as a bodyweight accessory circuit.

How to setup and use

Setting Up the DSH025 Abdominal Crunch

Load Olympic plates onto the bilateral weight loading points, starting conservatively on the first session to calibrate the correct abdominal working weight before progressing.
Set the seat angle to one of three positions based on your training target: the standard position for rectus abdominis focus or an adjusted position for oblique emphasis.
Sit on the spacious seat with the back resting against the angled rear pelvic support pad, positioning the pelvis so the pad contact supports the natural posterior tilt of the pelvis during the crunch.
Place the lower legs under and against the leg support pads so the legs are firmly anchored and will not lift or shift during the crunch contraction.
Grip the extra-long rubber-coated handles at the position along their length that allows a comfortable hold without requiring excessive shoulder flexion — move the grip inward along the handle if the shoulder needs to reach forward significantly to hold the outer end.
Confirm the pelvic support pad and leg pads are in firm contact before beginning the set.

Performing the Exercise

From the upright starting position with the abdominals in a full stretch, initiate the crunch by contracting the abs and driving the torso downward and forward through the precision linkage arc.
Focus the effort on shortening the distance between the lower ribs and the pelvis rather than pulling with the arms or rounding the shoulders forward.
Follow the linkage path through to the fully contracted position where the abs reach their shortest length, holding for one to two seconds before beginning the return.
Lower back to the full starting stretch position over at least two to three seconds, allowing the rectus abdominis to lengthen completely through the eccentric phase before the next rep. This phase carries significant hypertrophy stimulus and should not be rushed.
For oblique emphasis, adjust the seat to the appropriate position and allow the linkage path to drive through the corresponding rotational arc on each rep.
After the final rep, return the arm to the starting position before releasing the handles and dismounting from the seat.

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%

Abdominal Crunch DSH025

$1,989.00

$1,989.00 ~~$2,219.00~~ 10% off (Save$230.00 )

Commercial Grade
Pay With HFA/FSA

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The Dynasty Fitness DSH025 Abdominal Crunch is a plate-loaded core machine that trains the rectus abdominis and obliques through a seated crunch movement guided by a precision linkage system that closely follows the natural curve of the spine, delivering smooth, isolated abdominal contractions that floor crunches and cable crunch alternatives cannot replicate at progressive plate-loaded resistance. Extra-long rubber-coated handles accommodate users with different shoulder mobility ranges so the grip is comfortable and secure without requiring excessive shoulder flexion that causes spinal compensation. The rear pelvic support pad is angled to match the natural posterior pelvic tilt during the crunch, keeping the pelvis stable and the abdominal contraction on the correct path, while a three-position adjustable seat angle shifts the primary loading emphasis between the rectus abdominis and the internal and external obliques. Built from PT60×120×2.5mm steel with a 661 lb bilateral load capacity in matte black at 48.0" × 44.9", the DSH025 is built for commercial gyms, personal training studios, and serious home gym setups where heavy progressive plate-loaded abdominal training is a core programme priority.

Plate-loaded abdominal crunch machine with a precision linkage system that follows the natural curve of the spine through the full crunch arc, producing smooth isolated abdominal contractions with constant tension that floor crunches cannot deliver at progressive loads
Three-position adjustable seat angle shifts the primary loading emphasis between the rectus abdominis and the internal and external obliques, covering the full anterior core from a single machine position without changing exercises or attachments
Extra-long rubber-coated handles accommodate different shoulder mobility ranges so users of varying proportions find a comfortable grip without excessive shoulder flexion that would redirect effort away from the abdominals into the shoulder and upper back
Angled rear pelvic support pad matches the natural posterior pelvic tilt during the crunch movement, keeping the pelvis stable and the abdominal contraction aligned with the functional muscle path throughout every rep

How to Assemble Abdominal Crunch Machine DSH025

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Exercises and muscles targeted

Exercise	Muscles Targeted
Abdominal Crunch (standard seat position)	Rectus Abdominis (full length, primary), Transverse Abdominis (deep compression during crunch, secondary), Hip Flexors - Iliopsoas (minimised by leg support stabilisation), Obliques (secondary)
Oblique Crunch (adjusted seat angle)	External Obliques (primary - targeted through seat angle adjustment), Internal Obliques (primary), Rectus Abdominis (secondary), Transverse Abdominis (stabiliser)
Abdominal Crunch - Isometric Hold	Rectus Abdominis (sustained isometric at mid-range peak contraction), Transverse Abdominis, External and Internal Obliques (co-contraction during sustained hold)
Abdominal Crunch - Slow Eccentric	Rectus Abdominis (eccentric lengthening through full extension, maximum hypertrophy stimulus), Transverse Abdominis (eccentric), Obliques (stabiliser through controlled return)
Abdominal Crunch - Partial ROM (peak arc only)	Rectus Abdominis - Upper and Middle Fibres (inner arc emphasis at peak contraction), Transverse Abdominis (secondary), used for post-failure burnout sets and upper ab definition work

Who this machine is built for

How to setup and use

Setting Up the DSH025 Abdominal Crunch

Load Olympic plates onto the bilateral weight loading points, starting conservatively on the first session to calibrate the correct abdominal working weight before progressing.
Set the seat angle to one of three positions based on your training target: the standard position for rectus abdominis focus or an adjusted position for oblique emphasis.
Sit on the spacious seat with the back resting against the angled rear pelvic support pad, positioning the pelvis so the pad contact supports the natural posterior tilt of the pelvis during the crunch.
Place the lower legs under and against the leg support pads so the legs are firmly anchored and will not lift or shift during the crunch contraction.
Grip the extra-long rubber-coated handles at the position along their length that allows a comfortable hold without requiring excessive shoulder flexion — move the grip inward along the handle if the shoulder needs to reach forward significantly to hold the outer end.
Confirm the pelvic support pad and leg pads are in firm contact before beginning the set.

Performing the Exercise

From the upright starting position with the abdominals in a full stretch, initiate the crunch by contracting the abs and driving the torso downward and forward through the precision linkage arc.
Focus the effort on shortening the distance between the lower ribs and the pelvis rather than pulling with the arms or rounding the shoulders forward.
Follow the linkage path through to the fully contracted position where the abs reach their shortest length, holding for one to two seconds before beginning the return.
Lower back to the full starting stretch position over at least two to three seconds, allowing the rectus abdominis to lengthen completely through the eccentric phase before the next rep. This phase carries significant hypertrophy stimulus and should not be rushed.
For oblique emphasis, adjust the seat to the appropriate position and allow the linkage path to drive through the corresponding rotational arc on each rep.
After the final rep, return the arm to the starting position before releasing the handles and dismounting from the seat.

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.

Abdominal Crunch DSH025

$1,989.00

$1,989.00 ~~$2,219.00~~ 10% off (Save$230.00 )

Key Features

Precision Linkage System

The crunch movement arm follows a precision linkage path that replicates the natural curve of the spine through the full crunch arc rather than a simple single-pivot rotation. A single-pivot crunch machine produces an arc that may align with the spine at one point in the range but diverge at others, creating resistance at an angle that does not match the direction of abdominal contraction at each position. The precision linkage maintains alignment with the functional contraction path of the rectus abdominis from the full stretch at the bottom through to peak contraction at the top, which produces more consistent abdominal engagement and reduces spinal compensation throughout the set.

Three-Position Adjustable Seat Angle

The seat adjusts to three angle positions that change the orientation of the pelvis and trunk relative to the crunch linkage, shifting the primary loading emphasis between the rectus abdominis in the standard position and the internal and external obliques in the adjusted positions. Unlike a fixed-angle crunch machine that trains only the central rectus abdominis regardless of user preference, the three-position system allows a single machine to cover the full anterior core across a complete training session. Each seat angle locks securely and does not require readjustment between reps.

Extra-Long Rubber-Coated Handles

The extended rubber-coated handles allow users with different shoulder widths and mobility levels to grip at the position along the handle that keeps the shoulders relaxed rather than forcing them into the forward flexion that short handles demand. When the shoulders must reach excessively forward to grip a short handle, the erector spinae and upper trapezius activate to stabilise the shoulder position, which introduces spinal compensation that reduces abdominal isolation. The extra length eliminates this by giving every user a comfortable grip point regardless of their shoulder proportions.

Angled Rear Pelvic Support Pad

The rear pelvic support pad is positioned at an angle that matches the natural posterior pelvic tilt that occurs as the abdominals contract during a crunch. When the pelvis tilts posteriorly the lumbar spine flattens slightly, which is the anatomically correct position for maximum rectus abdominis shortening. A vertical or forward-angled pad forces the pelvis into an anterior tilt that partially countermands this and reduces the effective abdominal contraction range. The DSH025 pad angle supports the pelvis in the position that the abdominals need for optimal functional contraction.

Leg Support Pads

Firm yet cushioned leg support pads anchor the lower limbs during the crunch contraction, preventing the legs from lifting as the abdominals pull the torso forward. Without lower limb anchoring, the hip flexors activate strongly to keep the feet on the floor as the torso drives downward, which reduces the isolated abdominal stimulus and converts part of the set into a hip flexor exercise. The leg pads eliminate this by fixing the lower limb position so the abdominals work without hip flexor assistance from the first rep to the last.

Product Information
Product Name	Abdominal Crunch
Model	DSH025
Series	DSH Plate Loaded Series
Product Type	Plate-Loaded Seated Abdominal Crunch Machine
Primary Function	Seated plate-loaded abdominal crunch — rectus abdominis and oblique development
Target Muscles	Rectus Abdominis (primary), External and Internal Obliques (seat angle dependent), Transverse Abdominis (secondary)
Grade	Commercial
Colour	Matte Black
Dimensions and Weight
Length	48.0 in (122.0 cm)
Width	44.9 in (114.0 cm)
Height	64.4 in (163.5 cm)
Net Weight	282 lbs (128 kg)
Load Capacity
Maximum Load Capacity	661 lbs (300 kg) — 330 lbs (150 kg) per side
Loading System	Plate-loaded — Olympic plates, bilateral weight loading
Adjustability
Seat Angle Positions	3 positions — targets rectus abdominis, internal obliques, and external obliques
Pads, Handles, and Frame
Handles	Extra-long rubber-coated — accommodates varying shoulder mobility and width
Pelvic Support Pad	Rear angled pad — matches natural posterior pelvic tilt during crunch
Leg Support Pads	Firm and cushioned — anchors lower limbs, limits hip flexor involvement
Seat	Spacious — provides legroom and stable bilateral positioning
Movement System	Precision linkage — follows natural spine curve through full crunch arc
Main Frame Tubing	PT60×120×2.5mm rectangular steel
Finish	Matte black powder coat
Indoor Use Only	Yes

Q: Why use a plate-loaded crunch machine instead of floor crunches or cable crunches?
A: Floor crunches provide no resistance at the fully stretched starting position, which is where the rectus abdominis is most lengthened and where the hypertrophy stimulus is greatest. The DSH025 applies plate-loaded resistance throughout the entire arc including the fully stretched position, delivering constant tension that bodyweight and cable alternatives cannot replicate at meaningful progressive loads. Training the abdominals under progressive plate resistance produces the same muscle development response as loading any other muscle group.

Q: What does the three-position seat angle adjustment do?
A: The seat angle changes the orientation of the pelvis and trunk relative to the crunch linkage, which shifts which part of the anterior core carries the primary load. The standard position targets the central rectus abdominis through a direct forward crunch path. The adjusted positions rotate the crunch direction to load the internal and external obliques as the primary working muscles. Rotating through these positions across a core training session covers the full anterior core from central to lateral without changing machines.

Q: Why do the handles need to be extra long?
A: Users with limited shoulder mobility or narrow shoulder width cannot comfortably grip a short fixed handle without pulling the shoulder forward into excessive flexion, which activates the upper trapezius and erector spinae to stabilise the shoulder rather than keeping the effort in the abdominals. The extra-long rubber-coated handles allow each user to grip at the point along the handle length that keeps the shoulder naturally positioned, removing this compensatory pattern so the abdominals receive the full training stimulus.

Q: What is the role of the leg support pads?
A: The leg pads anchor the lower legs so they do not lift during the crunch contraction. When the legs are unsupported, the hip flexors activate strongly to prevent the feet from rising off the floor as the torso drives downward. This hip flexor activation competes with the abdominal contraction for which muscle group is primarily driving the movement. The leg pads remove this competition by fixing the lower limb position, ensuring the abdominals are the sole primary driver from the first rep to the last.

Q: How much weight should I use to start?
A: Start with a light bilateral load that allows 15 to 20 full-range reps with a deliberate two-second eccentric return on each rep. The goal in the first sessions is to establish clean abdominal-only contraction without hip flexor compensation before increasing load. Once you can feel the abs working cleanly through the full linkage arc across every rep, progress the plate load at the same rate as any other muscle group in your programme.

Q: What Dynasty Fitness machines pair with the DSH025 for a complete core training area?
A: The DSH025 covers the anterior crunch pattern for rectus abdominis and oblique development under plate-loaded progressive resistance. Pair it with the Abdominal Crunch DRE8035 for a selectorized alternative suited to circuit-based training or members who prefer a weight stack setup. The Abdominal/Back Extension DRE8009 balances anterior core training with posterior core back extension work from a single selectorized station. For lower back and posterior chain core strength, the Reverse Hyper DPB407 and Multi Back Extension DPB410 or DRE8040 complete the full core training area from both the front and back of the trunk.

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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.