Here is a popular summer toy that is great for development of hand and arm strength. Bonus! Teaches them to you work together as a team, because the ball won’t go if they are not in sync.
Disclaimer: Always check with your doctor before doing any kind of exercises. I am not endorsing any particular brand of this toy.
![](https://i.ytimg.com/vi/MVDNT4NmtUY/maxresdefault.jpg)