Spring Ankle

Stray Dog Strength Verified independent store

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The Spring Ankle Device was designed to be the ideal tool for working on efficient energy transfer, Designed by Cal Dietz of Triphasic Training and Minnesota University. The Spring Ankle series was created by sport/speed performance coach Chris Karfist and aims to enhance the transfer of power from the body to the ground by strengthening the entire chain of muscles and structures involved. This Product is Patent Pending. Show more