There are many different fitness trackers on the market that work well and even more that aren't worth a look. The ones that are the most useful, especially for outdoor exercise are apps that utilize the GPS in smartphones to track the time and distance of your activities. As I mentioned last week, the new iPhone 5s even offer a passive tracking chip in it so it can monitor your every movement and Moves offers this same type of tracking on older iPhones and Android.

MapMyFitness has become one of the main contenders in the fitness app arena and with 20 million users, they definitely have to be doing something right. The free version is extremely useful by itself, but also offers a paid version for $5.99/month that gives you expanded capabilities such as mobile coaching and interval training.