Go back ten years and buying a GPS running watch usually meant handing over some cash to Garmin, Polar or maybe Timex. For a long time these guys kept a niche audience of stat-obsessed runners to themselves. But fast-forward to 2015 and that's all changed. From the TomTom Cardio Runner and Mio Fuse to the Adidas SmartRun, Suunto Ambit and Fitbit Surge (not to mention Endomondo, Strava and Nike+ Running), there are dozens of brands and smartphone powered run-tracking apps queuing up to be your running partner. What the average runner demands from a running watch has also changed. Instead of simply telling us how far and fast we've run, we want real time stats that help us improve our running efficiency. We want devices that guide us through interactive interval sessions and we want to make sure we're getting the most out of every training session. That means accurate heart rate training. Enter the Garmin Forerunner 225, the first Garmin running watch to