Drink a bottle of beer first, then eat meat and drink milk every day.

Then start exercising every other day when you don't have a beer belly but your stomach is a little fat, but don't run. Running can easily make people lose weight, especially the one you are already thin.

Exercise indoors, practice push-ups, dumbbells, sit-ups and squats.

Remember: No matter how good the method is, we must stick to it. It's no use not insisting. The above four basic methods are the most effective. You should stick to it and go to the gym to work out. When you exercise, the coach will teach you how to increase your muscles, and he will also tell you to eat more potatoes and eggs.