Garmin's ForeRunner 305 is a next-generation personal trainers. The key feature is the ForeRunner 305's high sensitivity GPS receiver, which tracks your distance and pace using the GPS found in many of Garmin's products and also includes a heart rate monitor. But the ForeRunner series is designed for athletes of and is made to optimize your workouts. It monitors your speed, distance, pace and calories burned so you can train more effectively. With the 305, you can also use the heart rate monitor track your BPM. After you finish your workout, you can use the detailed post-workout analysis on you computer, through Garmin Training Center? software, to keep track of your workouts and make certain the next one is even better.