There was only one problem. “Tennis is an amazing sport. I love it,” says Eletrabi. “But one of the worst parts is picking up the balls.” That frustration spurred the creation of the Rover.

Do you have some tennis balls lying around your home? Dig them out and you can use them to mobilize your upper back, ...

In many ball sports like golf, football and tennis, controlling the ball’s spin is an important skill. Expert players can make golf balls curve around obstacles, launch footballs towards goal ...