5 Most Useless Workouts Ever

4. Leg extensions or leg press

The hamstrings are not very active at all during leg extensions or leg presses, so there’s a lot of sheer force and compressive forces created on the knee. If you’re trying to build strength in your legs and have no knee or hip limitations, it’s better to do something like a lunge or a squat where that knee extension motion is involved, but you’re also just utilizing a whole lot more muscle mass around that joint.

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