Activ8 Fitness Tracker Get moving with the Activ8 Fitness Tracker. Featuring a heart rate monitor, this fitness band is designed to deliver you the most accurate data possible, so you can train at your maximum intensity. The Activ8 tracker allows you to easily see how many steps you've taken, calories you've burned off and activity duration. Plus, it also offers a stopwatch so you can track workouts, running and aerobic exercises. So go ahead and move!