Exercise before meals at night is fasting exercise, which requires proper energy. People usually rely on sugar in their diet as their energy source, but when they exercise on an empty stomach, the main energy source is fat.

As shown in the figure below.

4. Recommend exercise methods according to different age stages.

(1) Young people: More suitable for playing basketball, high jump, etc.

(2) Middle-aged people: more suitable for barbells.

(3) the elderly: more suitable for square dance, walking, etc.

5. Precautions:

Whether you exercise before or after meals, you should pay attention to the places you should pay attention to. We shouldn't exercise half an hour before meals. Digestion of gastrointestinal tract needs the participation of digestive juice, and the brain should have enough time to secrete digestive juice half an hour before meals, which is beneficial to gastrointestinal peristalsis during meals. On the other hand, it should be noted that you should not engage in too strenuous activities before meals, which will easily reduce the secretion of digestive juice, and breathing heavily during exercise will also affect people's appetite. Exercise after meals, rest for half an hour first, so that the gastrointestinal tract has a digestion time, so as to avoid the decrease of blood in digestive organs and affect digestive function. It is not suitable for strenuous exercise for half an hour after a meal, at least one hour later.