As a rule, fitness coaching from wearable devices is pretty limited when you're in mid-exercise. They'll tell you when you hit your goals, but they don't really know you and your patterns. That's where LifeBeam thinks it can help. It's crowdfunding new earphones, Vi, that combine sensors (tracking aspects like heart rate and elevation) with an app-based artificial intelligence coach. The audio gear provides real-time advice that adapts based on numerous factors, ranging from your running technique to your stress levels. It'll even do its best to minimize exhaustion and injury.