This exercise focuses on the obliques but improves overall core strength and stability.
- Begin by sitting on the exercise ball, feet flat on the floor, holding on to the medicine ball at your left hip with both hands.
- Slowly bring the medicine ball upwards above your head, diagonally across your body, then back to your left hip. Repeat 10-15 times and then switch sides. Concentrate on keeping your abdomen and back tight throughout the exercise.