It is good for building small proprioceptive (stabilizing) muscles in the knees and ankles, which can potentially help reduce injury while helping with balance. Physical therapists use similar tools to rehab injuries. I made my own for next to nothing - 8" diameter industrial-grade plastic pipe (go to pipe supplier for a scrap or find one somewhere), some bathtub traction strips from Home Depot, scrap of thick plywood. My new thing is to balance on a 2x4 instead of the plywood - forces you to balance heel to toe in addition to left and right. It's pretty hard, you guys should try it. Just lay about a 3 foot section of 2x4 on your cylinder, step on and try to achieve stability.
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