The Timex Ironman Run x50 Plus gives all you fitness app junkies the ability to view your fitness app while you workout. After downloading the free Timex fitness app, connect the watch to your phone through Bluetooth to keep updated on your progress while you train. In addition to the watch's ability to display the included fitness app, it will also display texts, incoming calls, and emails. When not connected to the app, the watch maintains all the functions of a sport watch with a stopwatch, interval timer, and three programmable alarms. A water resistance rating of 50 meters, means the watch can be worn while swimming or running in the rain, so you won't have to leave the watch at home when you're training for your triathlon.