I have been making a mockery of the '220 minus your age' rule for maximum heart rate lately. Not sure if that's good or bad.
— Simon Dickson (@simond) October 4, 2017
I have been making a mockery of the '220 minus your age' rule for maximum heart rate lately. Not sure if that's good or bad.
— Simon Dickson (@simond) October 4, 2017