Just keep your thighs parallel to the ground. If the goal is low, you can set it for 20 minutes first. The degree of 20 minutes will basically not make people feel difficult to persist, and this time can also change the metabolism of the body and make breathing smooth and natural.

If you want to run longer, you should gradually extend it to 30 minutes and 40 minutes. It's a pity if you can run to 1 hour! It's best to run for two to three hours after dinner.