Leg Extension DRE8014
Leg Extension DRE8014
!!IMPORTANT!! 250lb upgrade is going to be ready by late April/beginning of May
The Dynasty Fitness DRE8014 Leg Extension is a selectorized quadriceps machine engineered through extensive biomechanical testing to position the pivot point at the precise location that aligns with the knee joint's natural movement axis, so the extension arc follows the actual path the knee takes through full leg extension and produces a mechanically correct quadriceps stimulus from the starting bent position through to the VMO-activating terminal extension at the top. A three-system adjustment architecture of 7-position ankle pad, 8-position backrest, and 5-position knee angle setting covers every combination of user leg length, torso proportion, and training preference to deliver a custom-fit extension position that single-axis machines cannot replicate, while a quick-adjust seat handle allows backrest changes without dismounting to keep training momentum unbroken between sets. The split two-section seat pad with a thickened front section elevated above the rear supports the back of the thighs at the seat edge, preventing the pressure and instability that flat seats create at the knee during heavy extension sets. The Dynasty Flex-Stack System delivers a true 1:1 felt weight ratio throughout the quadriceps extension arc. Built to commercial grade at 55"×43"×63" with a 210 lb standard stack and a 250 lb upgrade option available through Dynasty Fitness, the DRE8014 is built for commercial gyms, personal training studios, and serious home gym setups where biomechanically precise selectorized quadriceps training is a lower body programming priority.
- Pivot point positioned through extensive biomechanical testing to align with the knee joint's natural movement axis, delivering a mechanically correct extension arc that maximises quadriceps activation and reduces joint shear forces through every degree of the extension from start through to terminal VMO contraction
- Three-system adjustment — 7-position ankle pad, 8-position backrest, and 5-position knee angle — covers every combination of leg length, torso proportion, and training preference for a custom-configured extension position that single-axis machines cannot achieve
- Quick-adjust seat handle changes the backrest angle without dismounting, keeping session flow unbroken during giant sets and high-volume quad training where multiple backrest positions are programmed within the same session
- Dynasty Flex-Stack System delivers a true 1:1 felt weight ratio so the stack weight selected is the actual resistance the quads work against through the full extension arc, making progressive overload tracking accurate from the first session through to the most advanced training loads
Get 20% off when you order 4 or more pieces of equipment!
Exercises and muscles targeted
Exercises and muscles targeted
| Exercise | Muscles Targeted |
|---|---|
| Leg Extension (bilateral) | Rectus Femoris (primary — bi-articular, crosses both hip and knee), Vastus Lateralis (primary — outer quad), Vastus Medialis (primary — VMO peak activation at terminal extension), Vastus Intermedius (primary), Tibialis Anterior (stabiliser at ankle contact) |
| Leg Extension — Terminal Hold (peak) | Vastus Medialis Oblique (VMO) (maximum isometric contraction at full knee extension — teardrop definition stimulus), Rectus Femoris, Vastus Lateralis, Vastus Intermedius (co-contraction at lockout), Tibialis Anterior (sustained stabiliser) |
| Leg Extension — Slow Eccentric | Quadriceps — all four heads (eccentric lengthening from full extension through to starting position — maximum hypertrophy stimulus), Dynasty Flex-Stack 1:1 ratio maintains consistent resistance through full eccentric lowering arc |
| Leg Extension — Backrest Adjusted (varied hip angle) | Rectus Femoris (more reclined backrest increases hip flexion, stretching Rectus Femoris at the hip — increased bi-articular stimulus), Vastus Lateralis, Vastus Medialis, Vastus Intermedius (activation pattern remains consistent regardless of backrest) |
| Leg Extension — Partial ROM (terminal arc only) | Vastus Medialis (VMO) (sustained time under tension in the upper extension arc — terminal extension strength and teardrop definition), used for post-failure burnout sets and VMO isolation finishers |
| Leg Extension — Drop Set | Quadriceps — all four heads (extended time under tension through stack weight reductions — selectorized format enables instant drops without repositioning), extended quad fatigue accumulation beyond single working weight failure point |
The leg extension is the only exercise where all four quadriceps heads are the primary movers simultaneously, without significant contribution from the glutes or hamstrings. The rectus femoris is additionally affected by the backrest position on the DRE8014 — it is the only quadriceps muscle that crosses the hip joint, meaning a more reclined backrest increases the stretch on this muscle by increasing hip flexion. Changing the backrest angle between sets therefore changes the training stimulus for the rectus femoris specifically while keeping the vasti at consistent activation, making the DRE8014's 8-position backrest a meaningful programming tool for targeting different components of the quadriceps group within the same session.
Who this machine is built for
Who this machine is built for
How to setup and use
How to setup and use
Owner's Manual
Owner's Manual
Access the complete assembly guide, parts list, and maintenance schedule below.
Shipping & Delivery
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?
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?
Need Installation Help?
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| Product Information | |
| Product Name | Leg Extension |
| Model | DRE8014 |
| Series | DRE80 Selectorized Series |
| Product Type | Selectorized Leg Extension Machine |
| Function | Seated leg extension — bilateral quadriceps isolation |
| Target Muscles | Rectus Femoris, Vastus Lateralis, Vastus Medialis, Vastus Intermedius (all four quadriceps heads, primary) |
| Resistance System | Dynasty Flex-Stack System — 1:1 felt weight ratio |
| Pivot Development | Extensive biomechanical testing — aligned with knee joint movement axis |
| Grade | Commercial |
| Colour | Black |
| Dimensions and Weight | |
| Length | 55 in (139.4 cm) |
| Width | 43 in (108.0 cm) |
| Height | 63 in (160.2 cm) |
| Net Weight | 503 lbs (228 kg) |
| Weight Stack | |
| Standard Weight Stack | 210 lbs |
| Upgraded Weight Stack | 250 lbs — contact Dynasty Fitness |
| Adjustability | |
| Ankle Pad Positions | 7 positions — telescopic frame adjustment |
| Backrest Positions | 8 positions — quick-adjust handle, changes without dismounting |
| Knee Angle Positions | 5 positions — pivot alignment adjustment |
| Pads and Body Support | |
| Seat Design | Split two-section — thickened front elevated above rear for knee joint support |
| Abdominal Pad | Front torso anchor — prevents hip lift under heavy extension loads |
| Ankle Pad Surface | Leatherwear foam — durable shin contact surface |
| Mechanism and Pulleys | |
| Pulleys | 4.5" pulley x2, 3.5" pulley x1, V-pulley x1 |
| Bearings | 6005 x6 |
| Frame and Construction | |
| Main Frame Tubing | 1.97"×5.9"×0.1" rectangular steel |
| Movement Arm Tubing | Φ2.4"×0.1" |
| Indoor Use Only | Yes |
Dynasty Resistance Elite

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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.
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