70 to 90 bpm is pretty high for a resting heart rate, like my little dog.
I was an athlete when I was a teenager and in my early 20's but have been a (slim) couch potato ever since. My resting heart rate was about 65 bpm recently and now with the Metoprolol pills (they slow down the hearbeats but make each beat much stronger) it is 50 to 60 bpm.
My heart rate is pretty high
In the Cardio excercise healthclub at the hospital I got my heartrate up to about 180 running on the treadmill and the pretty nurse told me to "cool it". But I felt fine. During the final "stress test" at the hospital I sustained a heartrate of 180 for a long time before I ran out of breath blowing into the breathing tube. Otherwize I felt fine.
You're not supposed to exceed your 'maximum' heart rate - which is 220 minus your age. For training purposes you're supposed to get to about 80-85% of that maximum figure, and keep it there for an hour of training. This does the maximum good for your cardio-vascular system, and burns off most fat.
When I used to go to the gym, I used to do 5 minutes on each machine, the first four minutes on the treadmill I ran at a reasonable steady pace, then for the last minute ran the machine flat out - I didn't 'sweat' - I 'splashed' and my heart rate would peak above 220.
EDIT: Neil who used to work with me was a VERY fit young man, he did body building and fitness training - his heart beat was incredibly low. He was in Hospital (for an inflammed testicle!) and they wouldn't let him out - when he asked why, he was told there was something wrong with his heartrate, as it was abnormally low he was just super fit.
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