- Sit-ups can train vital capacity and muscle endurance.
I can complete 30 sit-ups in one minute.
I am used to doing 50 sit-ups before going to bed.
Sit-ups can train your waist strength.
Sit-ups are a common fitness exercise.
When I was a soldier, I had to do 100 sit-ups every morning.
Some people think that sit-ups have little effect on fitness training.
The wrong sit-up posture can cause spinal injuries.
Sit-ups can exercise the muscles of the waist, but the effect on the exercise of the abdominal muscles is limited.
Some professional fitness experts say that sit-ups are dangerous exercises.
Sit-ups are basic training items in military training and martial arts training.