It’s that time of year again when millions of us in the U.S. make New Year’s resolutions to improve ourselves in some grand way – often by means of getting in shape and/or leading an overall healthier lifestyle. And this year we’re sticking to it – right? Well, at least until mid-February. Fortunately this year there are dozens of free mobile health apps that can help us with our resolutions - or at least make it more fun trying.  There’s literally an app for everything from helping you lose weight to tracking your menstrual cycle, monitoring your heart rate, and...