Anecdote time here, but spending some time in a steam room and then entering a cold bath, and doing this 3 times or so, feels like a great cardio workout withou

Anecdote time here, but spending some time in a steam room and then entering a cold bath, and doing this 3 times or so, feels like a great cardio workout without the muscle soreness. There's definitely a lot of energy expended, particularly by the circulatory system, in keeping one's core temperature more or less stable.