Smartballs Duo is the easy-to-use training partner for those who have already trained with the Smartballs Uno or who naturally have a stable pelvic floor. It is especially suited for experienced users. Inserted like a tampon, the Smartballs Duo adapts to the body and can barely be felt when worn. The constant and nearly soundless rotation of the inner balls works with everyday movements to trigger muscle contractions, thereby strengthening the pelvic floor. Short, regular training phases lead to the most effective improvements. As with any muscle group, the fitness gained diminishes if training is discontinued – so even after successfully stabilizing the pelvic floor, Smartballs should be continuously used for maximum results.