Until GPS sports watches most runners tracked their progress with their cellphones or an old school notebook and pen. You can still do that of course, but if you want to simplify your run tracking and get very useful extra data on the way then...
Until GPS sports watches most runners tracked their progress with their cellphones or an old school notebook and pen. You can still do that of course, but if you want to simplify your run tracking and get very useful extra data on the way then...