With so many options in a flooded market, it can be difficult to discern the right tracker for you, which is why we wrote this list. Our favorite fitness tracker at the moment is the WHOOP Strap 3.0. The upfront cost is very low at around $30, though there is a monthly subscription fee. It can track a ton of important metrics including the usual suspects, like heart rate and steps, as well as others like stress, caffeine intake, and sleep.