Traditional ball machines drill repetition into you. The Pongbot Pace S Pro drills tennis into you.

Ball machines have been around for decades. Most of them do the same thing: fire balls at timed intervals and let you hit.

Matt Elliott is a senior editor at CNET with a focus on laptops and streaming services. Matt has more than 20 years of experience testing and reviewing laptops. He has worked for CNET in New York and ...