You can't exercise immediately after a meal. It takes half an hour at the earliest. After a meal, the stomach is full, even a slight exercise will make the stomach shake, increase the burden on the gastrointestinal tract and affect the digestive function. After a meal, a lot of blood is concentrated in the digestive tract, which reduces the blood supply to the brain, causing slight ischemia and making you feel sleepy. Walking at this time, especially for the elderly, is prone to accidents. Walking immediately after meals will cause dizziness, fatigue, dizziness and numbness of limbs for people with coronary heart disease and myocardial infarction; For patients with digestive tract ulcer and gastroptosis, the condition will be aggravated. It is advisable to sit still for 30 minutes before activities after meals.