Target area(s): chest, back and abs
How to perform the stability ball push up and pull in:
Begin with your shins on the ball. Your hand should be supporting your upper body and be about shoulder-width apart.
Lower your upper body to the floor by bending your elbows.
Push back up to the starting position.
Keeping your hands in the same position begin to roll the ball in toward your chest. The ball will roll and end under your feet. Try to focus on keeping your abs lifted.
Slowly roll the ball back out to the starting position.
Congrats this is a tough one! The push up and pull in equals 1 rep.
Complete 3 sets of 8-10 reps, resting for 60 seconds in between each set.
Get Healthy With Heather 
Will do these tomorrow in the gym. Great combo move!