Vivofit is an incredibly intelligent tracker, which learns your current activity level and assigns personal and attainable daily goals. As milestones are met, Vívofit adjusts goals for the next day, gradually nudging users towards a healthier lifestyle – it’s like a personal trainer! This Garmin tracker monitors steps, calories, distance and sleep and can be paired with a Garmin heart rate monitor for fitness activities. The tracker’s average battery life comes in at 1 year, and it is water resistant to 50 meters.