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.
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