Big hamster ball for human

You must’ve seen the hamster playing in the ball to keep rolling to enjoy the fun. Can you imagine human being inside the hamster ball to enjoy that kind of fun?
Well, you can. There is a water ball called human hamster ball for players being inside the huge water ball to roll around the water surface without getting wet.
Like hamster ball, it requires people keep moving to keep the ball rolling. But unlike the hamster, it is not easy for human beings to keep balance inside the water ball to keep the ball moving perfectly, it requires practices and skills, which is the fun!