Running with an AI 'personal trainer' is fun, but expensive

The artificial intelligence that we hope will exist in our lifetime is a world away from what's available right now. A thinking computer that knows us better than we know ourselves, and can make us better than we are, is still the stuff of fantasy. But, if our goals are simple and easy to understand, does an AI really need to be that smart to get the job done? It's a question that I've been musing ever since I started testing Vi, which its creators call the "first true AI personal trainer." It combines a pair of bio-sensing headphones and app from Lifebeam, a military biosensor firm founded by a pair of former Israeli air force pilots.