I've heard from a lot of people that swimming helps relieve sore muscles, is it true?
If true, why?
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If we're talking about delayed onset muscle soreness (DOMS), there is little that attenuates the discomfort.
I don't think there's any evidence to suggest swimming in particular helps, but anything that increases blood flow to the area will lessen, to a degree, the pain.
Light exercise (of all stripes, so long as you're exercising the affect muscles) seems to help a bit through the poorly understood mechanism of exercise induced hypoalgesia.
As an example, most people with DOMS in their legs will feel less discomfort if they go for a walk. But when the walk stops, their legs are sore again.