Sit-ups can be practiced every day.

Human muscles are divided into two categories: dense and loose. Most muscle groups are loose and require heavy weights and low reps. Moreover, after a system training, it takes 48 hours to repair. The abdominal muscles, forearm muscles and calf muscles are dense muscle groups, which require small weights and multiple repetitions to be effective, and require 24 hours of repair time, so the abdominal muscles can be trained every day.

The exercise method for both sides of the belly is the same as sit-ups, except that when you stand up, you can turn your body 90 degrees to the side.

Tell you the scientific method of abdominal muscle training:

To train the lower abdomen: sit ups, bend the knees to 90 degrees, do not lie flat. 15 reps per set. If the intensity is high, hold your hands in front of your chest. If the intensity is moderate, put your hands behind your head. If the intensity is low, hold dumbbells or barbell plates behind your head with both hands. Upper abdominal training: Grasp the bar with both hands, hang with your legs together, and lift your legs as close to your chest as possible.