Hurry over to Walmart to get this Fitbit Charge 4 Fitness Tracker for Only $69.99 Shipped! (Reg. $150). With Fitbit Charge 4, there’s no limit to how far you can go. This sleek, swim proof tracker is packed with features that help you know your workouts and your body better—like built-in GPS, Active Zone Minutes, new exercise modes and sleep tracking. Plus, with Fitbit Pay and up to 7-days of battery life, you get more convenience on the go and more inspiration to reach your fitness goals.