Garmin's Forerunner range has been at the, erm, forefront of the multi-sport watch world since 2003, but with more choice than ever in the world of fitness and health tracking, competition is intense.

Ask a dedicated runner if they track a workout, and you’re likely to get a strange look. Who doesn’t log every single mile? The easiest way to do it is to invest in a smartwatch with a built-in GPS, ...