My fit bit calculates calories burnt based on heart rate, is it actually the heart pumping that burns the calories?
So if I watched a scary film that made my heart pound, or ride a roller coaster, or drank a realky strong coffee or anything else that raises the heart rate but isn't actual activity, do those things burn calories because the heart is beating faster?
Not planning to use any of this things as weight loss aids, I obviously just have nothing better to do than ponder random crap on a lock down Sunday.