During outdoor runs, rides, hikes use built-in GPS to see your pace and distance. Use 24/7 heart rate tracking with Fitbit’s enhanced purepulse 2.0 technology. Active zone minutes give your wrist a buzz when you hit your target heart rate zone. Know your body better by using your watch and the Fitbit app to log periods. Water-resistant to 50 metres, which means you’re free to track laps in the pool.