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Since you're doing this every 12 minutes, you'd stay relatively warm all day. American football players don't need to warm up every time they come off the sidelines

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But they do... lots of teams have stationary bikes on the sidelines. No athlete would sit motionless for 12 minutes in the middle of a competition, not too mention that players would go through a much longer warm up before the game.

But I agree that going full force very briefly on a stationary bike with no warmup is probably fine for most people.

Fair, but a lot of them do sit on the bench and do some moderate walking at most.

I'd expect people doing these regular sprints to be more aware of their body and move around more in anticipation of the next set.

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