* clubs and programs<ref>https://www.reddit.com/r/orangetheory/wiki/index</ref><ref>https://old.reddit.com/r/crossfit/wiki/index</ref><ref>https://old.reddit.com/r/kettlebell/wiki/index</ref>
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* also Exercise intensity
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* also Exercise intensity<ref>https://en.wikipedia.org/wiki/Exercise_intensity</ref>