Are leg extensions a waste of time?

The Leg Extension Machine Why it’s a waste: “The stated goal of this machine is to strengthen your quads, but you actually end up just putting a lot of stress on your knees as you straighten your legs from the seated position,” explains Justice.

Are leg extensions really that bad?

Leg Extensions aren’t inherently “bad” for your knees. There are plenty of intervention studies that have used leg extensions to rehab knee injuries, such as patellar tendinipathy. They provide a controllable environment where the load and range of motion can be carefully manipulated over time.