Morning exercise is a sacred way for many people to have a good figure, but in fact, morning exercise is not the best choice, because blood is sticky and blood sugar is low in the morning. At this time, exercise, especially high-intensity exercise, is easy to induce myocardial ischemia and syncope. Besides, one of my own aunts died during morning exercise. She skips rope on the roof after getting up every day. Because of low fasting blood sugar that day, she only jumped for a while and then fainted. Unfortunately, when she fell, she hit her head on the flower bed and hurt her brain stem, and died unfortunately. So aunt, I suggest you put your exercise time after dinner, which is much better. At this time, the state of exercising the human body is better than in the morning. As for the specific training time, it can be determined according to your own situation and your physical condition at that time. Generally speaking, about 20 minutes can basically achieve the effect of exercise. Of course, it is better to persist for more than 30 minutes, but persistence is king. Make exercise a habit and don't make it a burden to you. When you think aerobics has become your habit, I think you should already have a healthy body. I hope it works for you.