Windows Phone owners have their choice of activity tracking apps, but few of those apps will tell you how to remain healthy after youve taken off your running shoes. Its a good thing that Microsoft has released a beta of Bing Health Fitness for Windows Phone, then. The software uses GPS to quantify your biking and running like many of its peers, but it also provides health advice; much like the Windows 8 app, youll find a diet tracker, exercise instructions and a symptom research tool.