This is a good warm up exercise for the quads. How to do: 1. Sit on the seat of a leg extension machine with the foot pad firmly placed on the inner part of your ankle. Make sure your knee is flexed at a 90-degree angle. If your leg is forced too far beyond this, knee damage can result early in the movement. 2. Extend and straighten your lower leg. 3. This is the … [Read more...] about Quadriceps Single Leg Extensions