You can't nail the perfect squat with just an iPhone app

With or without weight, it's widely regarded as the best exercise you can do. But one that's easy to get a little bit wrong and ruin all those benefits. So here's Kaia Health's Perfect Squat Challenge app, developed with input from both physiotherapists and sport scientists to help you nail the form. In the company's press release, Maximilian Strobel, Head of Kaia Health's AI Lab said: "Breakthroughs in AI-powered motion tracking and correction technology mean that everyone now has access to a virtual personal trainer and physiotherapist on their iPhone -- and can perfect exercises such as the squat." "Perfect" is a brave word choice -- debate over ideal squat form often reaches yanny-or-laurel levels -- but the app is, still, rather remarkable.