Your heart will beat a fixed number of times before it shuts down. To insure that you don't blow your quota by age 50, you need to keep your resting heart rate below 60 beats per minute. Find your resting rate by taking your pulse in the morning while you are still in bed; multiply the beats in 15 seconds by four.
Exercising at moderate intensities for long periods will lower your resting heart rate over time. A weekly goal should be: at least four 40-minute aerobic workouts. To maintain an effective workout pace, use a heart-rate monitor or keep varying your intensity. For example, run, bike, row slowly for 3 minutes, then go all out for 1 minute.
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