To gain weight during fitness, you can appropriately increase anaerobic exercise (such as equipment, yoga, etc. ) and reduce aerobic exercise (such as running, spinning, etc. ), and eat a lot of protein, such as eggs (no more than one yolk per day), beef, milk, chicken breast, etc. After half an hour of exercise, you should ensure adequate sleep and intake of fruits and vegetables, and do not eat high-calorie foods, such as fried foods and carbonated drinks.