The most effective, fast and safe method is

Do sit-ups

. We must stick to it.

Make 60 to 100 pieces every day. It will have obvious effect in a month.

It may be less at first, but it doesn't matter, you will do more and more slowly.

previous

traditional method

Straighten your legs and let your friends hold your legs and start doing it.

However, the research of health experts shows that the traditional methods are inefficient.

The correct way is

Lie flat and slowly lift your legs so that your calves are at right angles to your thighs, that is, perpendicular.

Then use a towel to bypass the back of the head, pull the towel with both hands and focus on the abdomen.

This method is much more efficient than the traditional method, and it can not only exercise the abdominal muscles and make the waist thinner, but also exercise the arms, thighs and calves at the same time, making the whole lower body look more stylish and the arms more powerful.