Ever wanted to know what muscles get hit by what leg exercises?
Ever wanted to tell people that squat stance doesn't affect the muscles recruited and never had the ammo?
Well now you have what you need.
The thing about measuring muscle involvement in an MRI is that you don't necessarily get to see all the other muscles that are recruited during a major lift. What you see is the cross section you measure.
I know House does it differently, but I'm sure that his budget is higher than that of BBing researchers. So when you see these charts bear in mind that they aren't taking into account the hip muscles and any of the trunk and upper body involved, just the muscles of the leg.
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