Treadmill can run for a long time but can't run on ordinary roads, because the outdoor running posture is not strictly controlled, and the air time is longer without propulsion. The air time comes from the vertical jumping force, and the propulsion force comes from the back swing and back pedal made by the lower limbs.

2. Different respiratory effects

Gym treadmill running is indoors, the air flow is small, there is basically no wind, and the impact on breathing is small;

However, when running on ordinary roads, the air flows quickly, and there is wind on your face when running, which will affect your breathing.

3. Different operating slopes

Treadmill has a function that outdoor running can't achieve. Treadmill can provide a stable slope, which can't be simulated. However, the slopes of ordinary roads are not completely consistent, and there are high and low slopes, which affect the operation effect.

4, the degree of labor saving is different.

Running on the treadmill will be more labor-saving than running on the road. Indoor, runners don't need to overcome air resistance, and the running belt under their feet automatically moves backwards. This is where the treadmill really saves effort than running on the horse road. Moreover, the elasticity of the running belt will also reduce physical exertion.