Do you have some tennis balls lying around your home? Dig them out and you can use them to mobilize your upper back, strengthen these hard-to-train muscles and correct poor posture with this novel ...

Tenniix the AI tennis robot offers personalized practice with speeds up to 75 mph, 5,000 RPM spin and over 1,000 training drills across three skill levels, all controlled by voice or smartphone app.

The machine holds up to 140 balls and gets 4-5 hours of run time from a full battery charge. It has a compact footprint of less than 2-feet in height, width and length and weighs around 35 pounds.

The best male tennis player in America has a coach who knows how to play tennis on grass. World No. 5 Taylor Fritz is working ...

And no, it doesn't hit the ball back using a tennis racket held in a robotic arm. In Rally mode, the Acemate can be loaded with up to 30 balls at one time Acemate ...

Price: Entry-level machines can be found for as low as £500, while high-end models can go up to £3,000 or more. Consider your budget and how much you’re willing to invest in this training tool ...