The best exercise heart rate varies with age, sex, physique and health status. Generally speaking, the heart rate of young people aged 20-30 is controlled at 150- 175 beats/min during exercise; The heart rate of middle-aged people aged 40-50 should be controlled at 140- 155 beats/min during exercise; The heart rate of the elderly over 60 years old during exercise is110-135 beats/min. This is the best heart rate and safe heart rate for fitness exercise.

Heart rate of moderate and low intensity exercise =(220- age) ×60%——(220- age) ×80%.

The maximum heart rate of a 20-year-old friend is 220-20 = 200. 200×60%= 120, 200×80%= 160, that is, exercise with a heart rate around 120~ 160 is effective and safe.

The maximum heart rate of a 30-year-old friend is 220-30 = 190. Then190× 60% =114 ~190× 80% =152, that is, the heart rate is114 ~/kloc.

A 40-year-old friend's maximum heart rate is: 220-40= 180, 180×60%= 108, 180×80%= 144, so a 40-year-old friend.

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