Not at all. I'm a sprinter, so I do take a quantitative approach to running. I also lift weights, and I would say that I do so seriously. But my weights are m

Not at all. I'm a sprinter, so I do take a quantitative approach to running. I also lift weights, and I would say that I do so seriously. But my weights are my own body and big rice sacks filled with water bottles that I heave around in various ways until I'm tired. I'm an experienced enough athlete to know when I'm hitting my limits, without following any specific metric.