Re:I'm 27 now, and we had these in high school (Score 1)

I'm 23 and I also used these in high school gym class. Our 'daily participation' points were tied to whether on not we spent 15+ minutes during gym between 135 and 180 bps. At the time, I was in much better shape, and remember disdaining the overweight kids that could simply walk around or clap their hands together to keep their heart rate up. The long distance track runners would have failed gym class if not for notes from their coach. None of the data (aside from your grade, of course) were ever recorded. I'm not sure if it would be scary or amusing to have your insurance premiums decided by your grade in gym . . .