I'm a fitness instructor, and I can do belly rolls. In fact, people who are not injured will continue to stimulate their abdominal muscles and make greater progress by doing abdominal rolling exercises at ordinary times.

Abdominal rolling

A. Key exercise area: upper abdomen. B. Starting posture: lie on your back on the ground, put your calves on the stool in parallel, make your thighs perpendicular to the ground, and cross your hands on your chest or cross your arms behind your neck. C. Action process: slowly bend the shoulder to the knee until the shoulder swelling bone is off the ground 1 ~ 2 inches, and keep still for one second. Then, return to it. In order to make the abdominal muscles contract better and make the lower back close to the ground, jumping and bouncing should be avoided at the beginning of the weight-bearing training course to help each lift.

If you have any fitness questions, you can ask this coach to answer them.