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Zach Mullins said he “discovered grip training a few years ago and became obsessed,” and marking his progress, Zach was just certified on the Crushed-To-Dust! Challenge, proving his superior all-around grip strength. Coming from a multi-sport and MMA background, Zach Mullins got into grip-strength training a few years ago, and has just been certified on the Crushed-To-Dust®!, proving his superior all-around grip strength.