I did 60 leg extensions every day for a week — here’s what happened to my legs

If you want to build powerful and defined quads, leg extensions are a staple isolation exercise featured in most leg day strength programs. But what happens when you do 60 reps every day for a week? I found out. 

As the name suggests, isolation exercises work one muscle group hard, whereas compound exercises (like a squat) target multiple muscles and joints together. In the single vs multi-joint resistance exercises (opens in new tab) debate, any strength and conditioning program worth it’s salt will adopt progressive overload techniques using a mix of both, focusing on the compound and adding isolation exercises as accessory moves to the big lifts.

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