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Sprinting requires three things: strong muscles in your legs and arms. A good cardiovascular system to help transport oxygen to the muscle groups that are doing all the work and some endurance so your muscles don’t cut out after that first, initial...

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from Tribesports

31 Day Pull-Up Challenge

31 day pull up progression challenge. Become a pull up pro by making steady progress following this guide. muscle and strength // pull-ups // chin-ups // health and fitness // gym workouts // exercise

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