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Guess what? A study done at the Biomechanics Lab at San Diego State University found that crunches on a ball rank high for strengthening and toning the rectus abdominis.
WEIGHTED BALL CRUNCH
Target Muscle: rectus abdominis
Set Up: Lie on stability ball holding a medicine ball or dumbbell with your arms above your head and close to your ears [A].
Action: Contract your abs and exhale while moving into a sit-up position, keeping the weight above your head [B]. Inhale while returning to the start position and repeat.
TRY OUR AT-HOME MODIFICATION!
Set Up: Lie on your back with your knees bent and feet flat on the floor, hip-width apart and extend your arms above your head (with or without a weight).
Action: Exhale while slowly lifting your shoulders off the floor. Inhale while returning to the start position and repeat.
Do three sets of 15 reps. | 
