2. BOSU Ball Stability Planks (Black Side Up) Flip a BOSU ball so that the hard side faces upwards. This also works with a balance board. Assume plank position with your forearms at shoulder width on top of the BOSU ball. Gently tilt your body and roll from side to side. Hold for 45 seconds. Up the difficulty, up your growth: Stack your feet on top of each other.
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