This is an in-depth review of the Garmin Vivoactive HR GPS Smart Watch. This best-selling fitness tracker is a four-in-one device: an activity tracker; a sleep tracker; a smart watch with notifications; and a GPS device to track your runs, hikes or bike rides. As such, it is an ideal fitness and activity tracker for dedicated athletes, particularly athletes who usually exercise outdoors, and athletes who do a variety of sports. For example, it would be an incredibly helpful tool for a triathlete. It is also an extremely handy fitness tracker for a cyclist, given that it has a built-in GPS and heart rate monitor, so that you don’t need to carry any other equipment to record a ride.