[TeMPOraL]

> Maybe the root cause (of interest in HIIT) is the standard American hurry.

I agree, I think that's the root cause. There are more things we'd like to do than time available, so people optimize.

> If we all slowed down we'd probably be more healthy as a people.

Probably true, but unfortunately we don't have much choice. We slave away most of our lives to keep the economy going, so it's hard to slow down. The problem isn't people having too much time for their hobbies.