Lie on your back and swing your legs to exercise your waist

Lie on your back and swing your legs to exercise your waist

Lie on your back on a mat or bed, cross your hands behind your head or grab a fixed object, and straighten your legs together;

< p> Actively contract the abdomen to swing your legs up until they are 90 degrees to the body.

Restore, repeat this action 20 times into one group, do 5-6 groups.