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used to do this during swim practice. unbelievably relaxing and amazing how far you can swim without a breath with a slow buildup. we used to go up to 4 lengths aka 100m

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I recall louis zamperini did similar exerxises to increase his VO2 max

What stroke? Seems like you'd choose a minimal stroke.

If you are without fins, a long relaxed breaststroke is what you do.

just freestyle, nice and relaxed. swimming distance isnt the best measure though, some people are more/less efficient than others.

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