the first group
Lift your upper body and put your hands horizontally in the air for stovepipe exercise.
the second group
Lie flat on the yoga mat, do cross-legged exercises, straighten your legs as much as possible, and exert strength on your waist and abdomen.
Third groups
Advanced version twist abdomen. Put your hands behind your ears, lift your legs and twist your abdomen at the same time.
Fourth groups
Difficult sit-ups, put your hands behind your ears, put your legs together and fly, do lift exercises, and exert strength on your waist and abdomen.