Avoid overstretching or agitation the tendon on the back of your knee with this Rogers Athletic Pendulum Prone Leg Curl. This machine gives you the ability to adjust the amount of stretch that takes place to avoid overextension.
The calf roller is not only adjustable, but also splits to show which leg goes where. The bottom pads sloped down for proper position of the legs and hips as well. This is a great machine to add to your gym or educational training facility.