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Is a Post Exercise Cool Down Really Necessary?

A post exercise cool down is recommended by physiology textbooks and personal trainers. But there is little evidence that it has any effect.

According to the New York Times, it can matter in some cases:

“Exercise researchers say there is only one agreed-on fact about the possible risk of suddenly stopping intense exercise ... If you suddenly stop, your heart slows down, your blood is pooled in your legs and feet, and you can feel dizzy, even pass out.”

But for most people, it has very little effect.  The idea of the cool down comes from a now-debunked theory stating that muscles become sore after exercise because of lactic acid build-up, which needed time to dissipate.

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