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This 5-minute ab finisher is the reincarnation of P90X’s ab ripper—and it builds a stronger, leaner core
From flip phones to frosted tips, the 2000s are back. And now, it's the turn of the century’s most iconic workout program: P90X. If you’re too young to remember, the original, 12-DVD set was a monster ...
Human functionality occurs in the shape of an X across the body from one arm down through the core to the foot, and the same on the other side. A big criss-cross, all driven by the power and synergy ...
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