Even though crunches on your back aren't a good idea for pregos, you can still tone your abs with this move. For an added bonus, you'll also work your chest and upper arms.
- Sit on the floor with a dumbbell in each hand. Bend your elbows slightly so your palms are facing the ceiling, and the weights are next to your hips. Lift your legs off the floor and balance on your bum with your knees bent.
- Lift both dumbbells up and bring them in front of your face. Then lower the weights slowly back to the starting position. This counts as one rep.
- Try to keep your torso and legs stable as you move through one set of 10 repetitions.