Joined: Dec 2004
Posts: 12,560
Likes: 799
From: Middle of da Mitten
Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, Bacchetta Quattro, Catrike Speed
It's called a "heard rate monitor."
Once upon a time not too many years ago I could put my HR at 165bpm and hold it for almost an hour. Nowadays it's more like 155bpm. I suppose tachycardia could have many causes, not necessarily just from a bad lifestyle. Michael Kim in the video may have a bit of a belly, but he's not quite to the "flashing advertisement for a heart attack" stage yet.