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Message: <blockquote data-quote="imhotep" data-source="post: 27317250" data-attributes="member: 562115">Swimming and running are different and it's not the same when you run for 15 mins against when you swim for 15 mins. Two major factors come into play - Oxygen (breathing) and the fatigue due to fighting against water resistance while swimming.In swimming you got to train yourself to inhale during your stroke recovery,  and exhale when your face is in the water (through your nose, mouth, or both).This technique is critical as CO2 (a waste product from muscular exertion) begins to build up and your muscles begin to become deprived of oxygen. This causes fatigue.  the holding of breath between inhalations causes incremental build-up of carbon dioxide called “stacking.”  Thus breathing out is just as important as breathing in..and swimmers who doesn't exhale properly will quickly feel winded because of this reflex. They probably aren’t really suffering an oxygen shortage really.  This as the reason many people feel more exhausted after swimming for 15 minutes as compared to running for 15 minutes.</blockquote>

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