For the first set, Hall starts off with a 24-inch high box (a lot more "in man inches," he jokes). He manages an easy 6 reps, then adds extra height so he's jumping 36 inches, which proves more difficult. Prior to attempting this set, Hall double-checks his positioning by planting his hands on the box first.
Raising the box height by an extra 6 inches to a 42-inch total makes the third set even harder, and Hall's jump fails to clear the full height.
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He follows this with a round of safety bar squats , consisting of a slow, controlled downward movement which recruits all of the muscles in the legs, then an explosive return to the upright position.
"It's important to keep shocking the body," says Hall. "That's what it's all about: keep shocking the body, keep it under pressure, keep it growing, keep it progressing all the time."
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