Track every lap in the pool, mile on the bike, and stride on the run with Garmin's Forerunner 910XT and heart rate strap. It's water-resistant to nearly 160 feet and easily adapts between swim, bike, and run. It also records transition times so you can analyze your entire workout or race. The swim metrics help you improve your stroke while the run and bike features ensure you increase your efficiency and nail your intervals. Heart rate is a great way to monitor your effort, keeping you within bounds of your prescribed workout. GPS lets you track your position, record distance, and monitor elevation gain. With an ANT+ power meter (sold separately), you can delve deep into power data and find your true potential. Once you’ve logged the miles, your Forerunner wirelessly transfers data to your computer back at home. Garmin's software even lets you plan workouts and upload them to the 910XT to help you take your training to the next level.