quadruplet

Lift your legs.

quadruplet

Abdominal rolling:

quadruplet

The rest time of abdominal muscles in each group is 20 seconds to 30 seconds. Do it as soon as possible after recovery, and the number of each group should be tired.

Practice more than four times a week.

It's good to have no fat. If the landlord has a lot of fat, it's not obvious to build abdominal muscles.