TheraBand Mini-Ball http://www.amazon.com/gp/product/B005VXFJ7K?tag=informasi0e-20 Strengthens key muscles in the abdomen Enhances core health critical for endurance posture balance Place the Mini Ball under your lower back when performing crunches for a more challenging intense workout Add an extra dimension of balance or resistance to your workout routine when positioned between your arms or legs or between you the floor or wall
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