Rahman “Ray” Grayson
Ray Grayson, better known by his social media moniker “Mr. Shut Up and Train,” hosts the largest free online fitness challenge with more than 100,000 participants signing up at a time. His Instagram account is filled with inspirational posts and clips that help drive sign-ups for the challenge, including full-fledged workout routines you can try at home. Most of these workouts are abbreviated so they just show the movements and the sequence, but it’s up to you to set your own timer to get to work.
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