8: Keep Your Core Tight

The core is the center of an athlete's strength. When you give special attention to strengthen and engage your core, it'll be there when you need it most.

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A Review of P90X2 X2 Core (Get through the fluff and it's a solid workout)

A Review of P90X2 X2 Core (Get through the fluff and it's a solid workout)

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8: Keep Your Core Tight

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