underbelly
The first episode:
Lie flat, legs together, straighten your body and use the strength of your waist and abdomen.
The back and hips are also straight up, away from the contact surface.
Then slowly put it down.
The number of repetitions is measured according to one's ability.
Two sets:
Lie flat and put your hands behind your head.
draw oneself up
Knee flexion
Use the strength of the waist and abdomen to make your body sit up straight and lie down.
The number of repetitions can be measured according to one's physique.
The third episode:
Lie flat, lift your legs up with the strength of your waist and abdomen, and at the same time, lean forward, put your arms flat and bend your body.
Try to make your arms and legs touch each other.
You can decide the number of repetitions of each exercise according to your ability.
Otherwise, you can go to 7d Slim official website, where there are some scientific exercise methods. Not bad either.