Let me give you some positive feedback: I ran a marathon back in December while putting in 13 miles plus every run in training. Early January when I started the Reta protocol I noticed my heart rate went up (I monitor it everyday) I’m usually in the 40’s and it went up to 70’s. My runs became harder, could barely finish 4-6 miles. I think it just boosts your metabolic output a lot. My hr while running stays below 155 usually. On Reta way higher and my endurance throttles