The Dynasty Fitness DSH017 Leg Extension is a plate-loaded quadriceps machine with independent left and right arm frames on four ball bearings that train each leg separately against its own bilateral weight horn, eliminating the stronger quad from compensating for the weaker one across every rep. The arm frames carry counterweights that offset the mechanical weight of each arm so the effective resistance at the starting position matches the plate load precisely, and ergonomically shaped FOAM ankle rollers follow the natural movement arc of the lower leg for smooth, consistent quad activation through the full extension range. An infinitely adjustable backrest slides on inner and outer slides with three rollers to position the knee joint at the correct alignment with the arm pivot for each user's leg length — the defining adjustment that determines whether the resistance arc loads the quad through its full range or only part of it. Built from PT60×120×2.5mm steel with a 661 lb bilateral load capacity in matte black at 63.0" × 63.0", the DSH017 is built for commercial gyms, personal training studios, and serious home gym setups where dedicated plate-loaded unilateral quadriceps isolation is a training priority.

• Plate-loaded leg extension with independent bilateral arm frames at up to 661 lbs total, each leg trains against its own weight horn with no compensation from the other side, making left-right quad strength differences visible and programmable from the first session
• Counterweights on each arm frame offset the arm's mechanical weight so the effective resistance at the starting position equals the plate load rather than plates plus arm, keeping load targets accurate across every working set
• Infinitely adjustable backrest on a three-roller slide system positions the knee precisely at the arm pivot for each user's leg length. The alignment that determines whether the quad is loaded through the full extension arc or only through a shortened partial range
• Ergonomically shaped foam ankle rollers align with the natural lower leg movement path through the extension arc, maintaining consistent pad contact and load transfer from the starting bent-knee position through to full quad contraction at peak extension