2. The normal walking speed of healthy adults is 1.75m/s-2m/s, and the average running speed is 3-5 times of the walking speed. There is no fixed value, because there is a certain relationship between physical differences and height and weight.
3. People who just run usually run 5-6 kilometers an hour, so they can speed up slowly. Amateur runners generally run at least 9- 10 kilometers per hour.
The definition of extended data operation means that terrestrial animals move with their feet. It is defined as a step in sports, and both feet will not land at the same time. It can also be aerobic exercise or anaerobic exercise. Running is a convenient way of daily physical exercise and an effective way of aerobic breathing. You will be very tired after running. Remember never to drink water immediately, and don't squat or lie down. You should do relaxation exercises to reduce fatigue.
Reference materials? Baidu encyclopedia-running