Movement: To begin the sit-up start with feet flat on the ground and knees bent. Contract your abdominals and raise your trunk up until it is vertical or nearly vertical to the ground. Lower yourself under control and repeat. Note that the hands may be placed in front of the body to make the exercise easier or behind the body to make the exercise more challenging. Do not however, use your arms to flex forward and cheat the exercise.
Caution: Note that traditional full-range sit-ups place the spine in end range flexion, which can cause damage over time. We rarely prescribe sit-ups for this reason, as many other exercises will also train the abdominals without the added strain and injury risk inherent in situps.
Instructions and effects for the Sit-Ups exercise 
