“There are two problems with coaching,” says Krishna Ramchandran. “One, not everyone lives near the coach who can train them best. And two, you can’t take verbal feedback home with you.” So the avid golfer, 34, created Ubersense, a free (for now) mobile app that aims to solve both problems. First, athletes record videos of themselves playing a sport. Then, via Ubersense, they dig deep: pinpointing their errors in slow motion, comparing their form with the pros’ and/or showing it all to their current coach — remotely or in person — for detailed feedback. Since its November 2011 public launch, roughly 800,000 Ubersensers have uploaded 6.3 million videos.