As a Physician who is deeply engrained in the world of Sports Medicine, the science behind what John is doing at Gateway CrossFit is spot on. My training sessions were specifically tailored to the needs of my body; in my case, it was working on my posture and correcting my implicit desire to constantly round my shoulders and hunch over. In addition, the WOD (work-out of the day) was a cardio explosion! Rarely are trainers able to incorporate both lifting and cardiovascular fitness!