I love this product! It is described as a post work out but my husband and I both very much like it as an Intra workout. We tend to have some very extreme workouts (including 30 minutes of cardio) and can feel our muscles shaking / hands shaking at the end of the work out. Jet mass not only keep us going but it also keep us from feeling that weak, shaking fatigue at the end of our workout. We had the tropical ice flavor and absolutely love it! I want to try the orange cream next!