Meredith Dietz is Lifehacker’s Senior Staff Writer. She earned her bachelor’s degree in English and Communications from Northeastern University, where she graduated as valedictorian of her college.

I’ve been living and training with the T-Rex 3 Pro for the past month and while I don’t think that it will have Garmin, Coros or Polar quaking in their boots just yet, there’s some good stuff here for ...