Balloon Tennis

For all ages: Find an open space for kids to set up balloon tennis court. Two chairs, a balloon, a string, and any “racquet”-like object (most popularly some fly swatters). Set two chairs at a reasonable distance and tape a sting between the two of them. Blow up your balloon(s) and let kids play! They can use their hands to play too. 

More directions: https://www.fatherly.com/play/balloon-tennis/