A watch or a personal trainer! The fancy yet effective Forerunner 620 GPS Running Watch by Garmin is not less than a personal coach stick to schedule. It keeps track of your performance, dictate about your work out capabilities, maintain your training schedule and advice you when to try again. The watch gives you the facts of your rhythm, steps per minute and degree of your bounce in the running through HRM-Run. You can also get an assessment about your heart rate with VO2 max.  The Forerunner 620 is lighter and thinner than its forerunner Garmin’s 610 with a hinged strap for more comfort and suitable for all the wrists in any marathon. The watch also has the social media connecting feature via Garmin Connect Mobile app or a Wi-Fi connection. It is available in 2 different color combinations with and without HRM-Run.

Available at amazon.com for $449.99