PRINTED ON TREADMILLS and exercise bikes in gyms around the world is a simple method for estimating the maximum rate at which your heart should safely beat, in beats per minute: 220 minus your age. MSN: Is It Safe to Exceed Your Maximum Heart Rate During Exercise? Exercising at your max heart rate might leave you drenched in sweat, but that doesn’t mean it’s something you should do regularly.

Understanding the Context

In fact, spending too much time in the high zone could cause symptoms ...