For the fashionista in you, the Forerunner 15 has all the same features as the 25. However, it has a more colorful range to choose from. Following on from the Forerunner 10, the 15 is a simple way to keep on top of your running and workouts, and the heart rate monitoring allows you quick viewing of what level of effort you are putting in. Top tip: if you are after your heart rate measurements you can also purchase the HR Monitor, compatible with your watch.