The exercise ball is a very useful tool that you can utilize in the gym as well as your house. Due to its slippery surface it makes many exercises more challenging, while it tests your ability to balance and strengthens your inner core. Therefore the use of this exercise ball is unquestionable as it is ideal for an abs work out.
Exercise ball 3 sets x 20 reps. Stand up straight and with both hands keep the exercise ball steady. Your arms should be at the level of your shoulders and parallel to the ground. Rotate your torso slowly to your left side holding tightly the ball and slowly turn to the right side (this is one rep). Keep the ball in a steady position.