Hurry up and ?weight?! Originally developed by sports scientists to help Olympic athletes train for marathons, these FDA-approved shoes are ?heavy? hitters in the world of physique-bettering sneaks. Each pair comes with two interchangeable midsoles?a regular one and a weighted one that turns everyday strolling into a super-effective resistance workout for firming the legs, hips and ?hindquarters?. And though the weighted midsole doesn?t disrupt your normal stride, you?ll feel your core and lower body muscles working with each step you take (even if none of those steps takes place in the gym)

Price: varies

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