I have been doing strength training for the past three years with a personal trainer. He focused on lifting weights to make me stronger. I thought I was doing well – my body had become better toned and I could lift more weight than I ever have been able to. Last year I took up distance running. I hoped that my hard work in strength training would help me in running. To my surprise, I didn’t make as much progress as I would have liked. I would get tired and I also started