Why Ass to Grass Squats Don't Use the Longest Effective ROM | Mark Rippetoe
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It seems to me that ATG actually still does use the longest effective range of motion, but no more so than a just below parallel squat. The problem is that it doesn't maximise the amount of weight that can be used in order to get stronger. ATG is therefore an inefficient, sub maximal way of training in order to get strong.
