Test Driving GAIN Fitness, The App That Turns Your iPhone Into A Personal Trainer [TCTV]

Summer is on its way, and self-improvement is on everyone's minds -- so it seems like each day I hear about a new must-have app focused on fitness, health, nutrition, or the "quantified self" in general. And now that the tech startup scene is hotter than ever, many of these apps are backed by serious investors and have big plans for the future. Take GAIN Fitness. The San Francisco-based...