Sit-ups: Bend your legs and keep your feet on the ground. When you get up, you are halfway up. When you lie down, you can't keep your waist on the ground. Repeat this action ... remember to keep breathing.

Sit-ups don't practice chest muscles. When doing push-ups, the direction of the palm can be adjusted by itself. You can practice different parts. When doing push-ups, be sure to keep your body straight.

Abdominal muscles are easy to practice, and they will be effective in a month at most (if you are not fat). It takes a long time for the chest muscles, but both movements should be adhered to.