Carry Some Weight
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If you really want to improve your swimming, the best way is with short bursts of intense pool training. I would try to train with a 10- to 20-pound weight – carrying it over your head and sidestroking, placing it between your legs as you paddle backward with your arms, and holding it against your chest as you kick on your back across the pool (if you make it before sinking). It will help you move water with your arms and hands and legs, and create that resistance that makes an efficient swimmer.