Clean Cult laundry detergent sheets are the only "equipment" you need. Fill out the form below, and we'll send you enough sheets for the five full workouts. YOUR THUMBS WILL NEVER BE THE SAME A highly targeted workout that exercises the three muscles which control your thumb movement. For a complete workout of your thenar muscles, simply reach into a box of Clean Cult laundry sheets, pull one out, and place it in the washer. Clean Cult laundry sheets are the only "equipment" you need for the Thenar Workout.