The straight-leg situp is a chest and back medicine ball exercise that works your rectus abdominis, the muscle group responsible for the six-pack look. This exercise also works your hip flexors and chest.
The straight-leg situp begins on your back, your legs straight in front of you, and the medicine ball in both hands above your chest. From here, sit up and reach for your toes as you press the ball overhead.
As you sit up, keep your legs straight and engaged. Return to the starting position and repeat the movement for 10-20 reps.
You can make it more challenging by holding the medicine ball in only one hand or adding a twist to the movement. To add a twist, reach for your right ankle as you press the ball overhead with your left hand. Return to the starting position and repeat on the other side.
You can add the straight-leg situp to a workout with other chest and back exercises to create a complete routine.
It is excellent for beginners because most people have experience doing sit-ups. It is also a relatively straightforward exercise that most people can do without too much of a challenge.