The Merrithew Mini Stability Ball - Medium is a compact and portable travel companion. It can improve posture and give you a full-body workout! Create levels of instability by moving the ball up and down your spine to activate your deepest stabilizing... more
The Merrithew Mini Stability Ball - Large is a compact and portable travel companion. It can improve posture and give you a full-body workout! Create levels of instability by moving the ball up and down your spine to activate your deepest stabilizing... more
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