Forget about cardio exercise when you have the Ultrastud. The bottom of this vibrator has a suction cup that allows it to be attached to flat surfaces. Choose your location & take a ride! Not only can you mount this super soft 8-inch jelly stud; you can choose your vibe speed & get more action from the clitoral stimulator. If you feel you have had enough exercise for the day; you can use it as a regular vibrator. Either way; you will be tingling with delight. This stud is a keeper.