Pump up your stability ball and ab-ball-ish your soft center with this core-focused workout. Remember that if you’re having trouble balancing on the ball, then create a wide base with your feet – whether they be on the floor or on the ball.Do you have a fitness resolution? Make progress towards achieving your goals with Skimble’s top fitness apps and supportive community. If you’re new to Skimble, our Workout of the Week challenges offer you fresh ways to be fit. Download Workout Trainer on your Android & Apple devices and do your first workout! Remember, if you want to stay up-to-date with our Workout of the Week challenges, be sure to have your Workout Trainer notifications turned ON in the app!