Crunches on an exercise ball

Exercise Ball

Crunches on an exercise ball are more difficult than they sound. You have to learn how to be balanced, flex and wok your abs. Your lower back should be near the top of the ball while doing this exercise. Then slowly roll your shoulders forward towards your hips. 16 to 20 reps a day for 3 weeks and then add a weight for added resistance and you’ll have firm abs in no time!