Fitness watches are extremely useful tools for when it comes to weight loss and fitness in general, but knowing which ones to purchase can be tricky. There are so many to choose from that one can easily find oneself overwhelmed and not knowing where to begin.  As well, you have to consider carefully the design features of the device and the type of functions you want for your training like a built in GPS, a heart rate monitor, and so.  What’s more, many of the more advanced models often retail for a lot of money. Here’s a look at 3 of the top fitness watches which are available for under $150.