Afraid of the water? The Garmin Forerunner 310XT isn’t. This GPS-enabled, swim-proof trainer – waterproof to a depth of 50 meters – will be your new best friend under the sea and on land since it also tracks bike and run data then sends it wirelessly to your computer. The multisport watch (though “watch” doesn’t do this thing justice) has up to 20 hours of battery life, tracks distance, pace and heart rate, and goes from wrist to bike in seconds. Want more? Forerunner also categorizes multisport activities in one workout and can log transition time in the process, so you can analyze your performance from start to finish.