Tummy Twister generates a natural aerobic workout by encouraging a twisting motion in your body. Twisting exercises improve the strength of important stomach muscles. A twisting motion through your stomach works on your internal obliques and external obliques. Step onto your twister while listening to music or watching TV and make exercise a pleasure. Both safe and effective, This AP Tummy Twister does not produce any side effects, even with prolonged use. Use your AP twister daily for 15 to 20 minutes in total and 5 minutes in one go for visible results. Please do not use on wet, uneven ground.