Sprinting, like 50 meter to 400 meter interval workouts 3 times a week, seems like it’s easily the most efficient and well rounded exercise for longevity and looking good. Why don’t more people do it?
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Trying this interval swimming daily and it feels great!https://myswimpro.com/blog/2018/11/14/how-to-swim-faster-with-interval-training/ …
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