“Obviously, there are no absolutes because people are built differently,” says Benjamin Butts, director of rehabilitation services and performance therapy at Providence Saint John’s Health Center in Santa Monica, Calif. “With all exercise, make sure you have the flexibility and range of motion to be able to perform the exercise using proper form. And only increase weight and repetitions incrementally over time to ensure you are able to handle the new stress.”
Leg extension machine
This exercise involves extending the legs up out in front of you with resistance in front of your ankles while in a seated position. It targets the quadriceps in front of the thighs.This exercise puts an unnecessary stress over the knee cap area, causing wear and tear. Instead, do multi directional (forward and side) lunges or squats.