You can't relax your abdominal muscle training for a moment. On the contrary, you need to constantly update your training methods. In order to keep your six packs, you should do this.
Bend over sideways exercise:
upright. Separate your legs, raise your arms horizontally, bend your upper body forward, touch your right foot with your left finger, and raise your right arm naturally without bending your legs or arms. Inhale, then return, and exhale. Change the direction again and repeat. Do it 8 times in a row.
Leg bending exercise:
Supine position. Keep your arms flat on the ground, straighten your legs, bend your knees and lift them at the same time, inhale, bring your thighs close to your abdomen; then exhale and slowly return. Repeat 8 times.
Raise your legs and abdomen:
Mainly develop the lower abdominal muscles. Lie on your upper body, straighten your legs and raise them as high as possible, then lower them slowly. After doing this exercise evenly, bend both knees and continue doing the same movement. Repeat 8 times.
Seated bend:
Mainly for the development of upper and lower abdominal muscles. Straighten your knees, lean your upper body back, maintain your balance, and then bend your knees and abdomen to make your abdominal muscles bend extremely. During practice, the feet can never touch the ground.
"Biking" exercise:
Supine position. Take turns in flexion and extension of the legs, imitating the movement of pedaling a bicycle, the action is faster and flexible, and the range of flexion and extension is as wide as possible. Lasted 20-30 seconds.
Twist:
Hold the handle or pull a certain weight with one hand, and do various postures of twisting and turning exercises to exercise the external oblique muscles and waist muscles.