Use a device to keep in mind the four notes.
Notice one: Do not exercise too much. In the past, people who regularly take part in physical exercise can increase the amount of exercise, generally with a pulse of not more than 110 times/min, the maximum is not more than 120 times/min. Old comrades who do not often or never take part in physical exercise are the first to choose the right sport.
Note two: Before the exercise must be prepared activities, warm-up 10-15 minutes or so. This prevents twisting the neck, twisting the waist and injuring the nerves.
Note Three: After the exercise to do some finishing activities. Because people in the movement after capillary expansion, if sitting on the ground does not move, the human blood in the body's distal can not return to the heart, will feel the heart oppressed, have high blood pressure and heart disease of the old comrades, after the exercise to walk, buffer 10 minutes or so.
Four: Take good exercise time. Old friends exercise time is best in about 40 minutes, left not less than 30 minutes, right do not exceed 1 hours.