Track your exertion threshold and work within specific zones to increase your endurance. Monitors use the pulse at your wrist or a chest-strap monitor to measure your heartbeat. Make sure the monitor you choose has the alarms you want and display you like. Some monitors allow you to transfer information to your computer, too.Shop Heart Rate Monitors
A running watch with GPS allows you to track your distance and elevation, determine pace and calories burned, and many allow you to transfer this information to your computer. Some GPS watches are rather large, so be sure the fit works for you and that the watch you choose outputs all your information in a method that allows you to easily integrate this information into your training plan.