Virtual personal trainer uses AI to get you fitter - and it's free

Executing the perfect exercise move is as much about technique as it is strength. And fitness enthusiasts have been paying personal trainers for decades in order to learn how to correctly pull off the right moves. Now there's a free app that offers to do the same thing by using motion-tracking technology and artificial intelligence to help you perform the perfect squat. Called the Perfect Squat Challenge, it was developed by digital therepy company Kaia Health who consulted with physiotherapists and sport scientists to figure out a squat that most of us can achieve. Once you fire up the app, you're guided through the motion by a virtual assistant called Kaia.