I would think a jump is basically triple extension: hips, knees, and ankles. So, your glutes, hamstrings, quads, and calves would seem to be the most important muscles. Maybe they said that because the rectus femoris, which is one of the heads of the quads, is also a hip flexor? I dunno, but I don't really see how the hip flexors aid in increasing your vertical leaping power...



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