The heat consumption of indoor running is generally 5% lower than that of outdoor running, partly due to wind resistance, and the running belt also has a slight speed-up effect. When running in mud, sand and grass, people's leg muscles move more vigorously, and there is no extra consumption on the treadmill.

If you want to burn as much calories on the treadmill as outdoors, you have to adjust it to the slope of 1%.

Compared with indoor runners, people who run on the sidewalk have a higher proportion of bone tension and stretching, so the probability of fracture will increase by 50%.

Always exercising the same body part and muscle may make the muscle tense for a long time, which is easy to cause sports injury, especially if the posture is not so correct.

The change of terrain and other environmental conditions can improve the runner's proprioception-the ability of the body to cope with different terrain and emergencies. This ability is very important, because the higher the frequency of unexpected tests, the higher the sense of balance, strength and running efficiency. What the treadmill lacks is the training of this ability.

In fact, both have their own advantages and disadvantages, and they should be chosen according to personal preferences. Many people don't want to run outdoors for safety reasons or feel embarrassed. Treadmill is a good substitute. Running on the treadmill is better than not running at all.