Yes, twisting movements will hit the serratus muscles. If you want to add bulk, you'll need to use some weight while twisting. BUT, be very careful, you can really screw up your back if you use too much weight. You can do twisting cruches or bent over twists with a broom handle across your shoulders. You can also do standing side bends with a bar across your shoulders.
If you have a workout partner, you can do medicine ball passes. Sit on the floor, back to back, and pass a medicine ball, back and forth, in a circular fashion. Good luck!
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