The reason is: lie flat, get up and touch your feet. When the hand touches the foot, the abdominal muscles have been relaxed (unable to continue to exert force)

Sit-ups: Many people will hold their heads with their hands, resulting in high pressure on the cervical spine (easy to get hurt).

All the above actions have shortcomings. Personally, I think the following actions are more appropriate:

One: Target exercise site: the upper part of rectus abdominis (upper abdomen) (abdomen rolling)

Action essentials:

1. Lie on your back on the mat, bend your knees about 90 degrees, relax your back muscles and spine, keep your legs straight together, and put your feet flat on the ground.

2. Lift your body, keep your lower back off the ground, reach out your hands to your calves, then return to your original position and repeat.

Two: the goal is to exercise muscles: the lower part of rectus abdominis (lower abdomen) (supine leg lifting)

Action essentials:

1. Lie flat on the mat or bench (but hold the bench with both hands and keep it stable). During exercise, the upper back, arms and hands remain motionless.

2. Keep your legs straight and lift your legs until your thighs are perpendicular to the ground; Pause, continue, repeat