Resting heart rates vary....in a normal healthy 20 year old, a resting heart rate can be anywhere from 58 to 72 beats per minute.....or so! As I said, the rates DO vary.....weight plays a factor, as well as stress levels etc. There can also be a big difference between a resting heart rate and the number of beats your heart produces during any physical activity. If you're concerned about what's normal for YOU, please see your doctor and have him keep a record of what YOUR heart rate is over a period of time. You'll know what YOUR normal heart rate is then! Good luck!