Things that I have noticed in my fitness journey:
3 Reasons why the Leg Extension Machine creates imbalances.
Reason #1: sitting while exercising your quads, rather than using them to get up and down is hard on joints, and the wrong way to train your quadriceps. I prefer open chain exercises vs. closed chain exercises. Example: A series of lunges would be a better way to train your quadriceps.
Reason #2: Only working one muscle group at a time instead of all sides of your leg. The less muscle involved equals less metabolic effect.
Reason #3: Since you’re only working the front of your thigh, you’re creating the most common leg muscle imbalance that exists i.e. weak hamstrings.