This exercise is good for the obliques, the muscles at the side of your middle.
Hold a ball or weight in your hands, (a weighted medicine ball works best) and twist slowly from one side to the other.
Variations of this are to roll the ball around your back and front, or to work with a partner.

BEGINNERS
Aim for 10 turns each side. Repeat twice.
INTERMEDIATE
Aim for 15 turns each side. Repeat twice.
ADVANCED
Aim for 15+ turns each side. Repeat twice.
Tutorial provided by netfit
Hold a ball or weight in your hands, (a weighted medicine ball works best) and twist slowly from one side to the other.
Variations of this are to roll the ball around your back and front, or to work with a partner.

BEGINNERS
Aim for 10 turns each side. Repeat twice.
INTERMEDIATE
Aim for 15 turns each side. Repeat twice.
ADVANCED
Aim for 15+ turns each side. Repeat twice.
Tutorial provided by netfit