Heart rate monitors help get rid of the guesswork, are popular in fitness classes across Colorado Springs
By: Jennifer Mulson firstname.lastname@example.org • Updated: 11 hr ago
Treadmill incline? Ten percent. Speed? 4.2. Heart rate zone? Still in the green.
As I huffed and puffed away on the treadmill and rowing machine, my eyes kept wandering up to the large scoreboards looming...