For all of you tracker fanatics out there, I have great news: Fitbit just announced the second generation to their Charge and Flex (Charge 2 and Flex 2 respectively) that is bound to make keeping tabs on your daily movement even easier. Lucky me, I got my hands on both wearables last week, ahead of their release, kicking off a week-long testing period with a 20-minute circuit workout from non other than former pro volleyball player Gabrielle “Gabby” Reece. (For the record, she was intense, and the workout was no joke!). Soreness-inducing circuit aside, here is what you should know if you are in the market for a new activity monitor: