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Static stretching should be avoided at the beginning of a workout.

I had assumed this was about sprinting in the sense of running as fast as possible, which would be absolutely insane to do without a warmup. I take around 20 minutes to warm up for sprinting, doing very specific exercises to prepare.

On a stationary bike though, because the range of motion is much more controlled, I can see it being a little less of an issue.

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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

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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