Hello. I am a fitness enthusiast, so I would like to share my personal experience here. My abdominal muscles are actually born, and I usually like all kinds of sports, especially basketball.

1, pay attention to diet, eat more fruits and vegetables, eat less barbecue spicy goods, drink less, and pay attention to work and rest.

2, insist on running, this is to have a fixed time, either in the morning or at night, the time varies from person to person, we must insist.

3, rely on some instruments, or stretching exercise. For example:

A. sit-ups, pay attention. Generally, sit-ups are not possible without weight. I suggest you take a 2.5KG dumbbell from the beginning, and be sure to remember to have your abdomen closed.

B. push-ups, you can put teaching in a higher place, or put some books under your feet.

C. practice yoga. In fact, although yoga is not very intense, it has many benefits to the body, promoting sleep, stretching the body, relieving fatigue, and is not limited by geography. Just practice in the living room at home.

D. Take part in various sports, ball games and swimming. . . .

I hope I can help your friend!