bubble water ball

Water walking ball is also human hamster ball, which human being inside the ball walk or runs inside to move the ball around like a hamster. The biggest difference is that human hamster ball plays on the water and much bigger. Considering the nature of water ball being played on the water surface and the safety of player, waterproof and airproof should be mandatory. And waterproof and airproof make the nature of bubble water ball that should not be being played for more than 20 minutes. Every 15-20 minutes, players should be outside the ball and refresh the air inside the ball for next round. And a rope should be tiding to the ball and connecting to the strong and big object by the shore to prevent the ball from going too far away and being out of control.