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Outside, it’s a few degrees south of zero. But inside this CrossFit gym in Grand Forks, N.D., a half-dozen fitness nuts–three men, three women–are just warming up. Tom Harmon, a former Army reservist ...

Air squats, also known as bodyweight squats, are common in training programs like CrossFit and workout routines. You should feel the squat in your thighs and in your glutes. Air squats are only done ...