Back Squat 5-5-5-5-5 reps
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"You can talk all you want about being in good shape until you do a few CrossFit workouts, and then you will realize - like I did - that what you have been doing is likely training strong points, rarely working on weak points, and training efficiency to such a degree that the workouts you do are less effective than they might be if you mixed energy modes, duration, and types, of work."
Mike Burgener with Tony Budding on "Learning the Olympic Lifts - The Stance" in this month's CrossFit Journal.