I received this complimentary from Influenster and I really loved it! It was my first time using it and I love how it lets you know how much fluid and sodium you have lost after a workout. After that, it personalizes your hydration needs (in the Gx App) for all of your future workouts which to me is so cool since everyone’s body is different and we all need different amounts of liquid before, during, and after workouts! I would highly recommend especially for people who workout a lot!