He must be around seventy-five, maybe older. I watch him during his careful but seemingly tireless workout on the elliptical cross trainer, his small and skinny body shiny from perspiration.
"I've got a new knee", he tells me later. Pointing at the rain outside he continues: "When I still went running, I used to wait for rain like that. Rain provides so much oxygen in the air, I was able to run around the world when it rained. Now my doctor doesn't allow me to run anymore. Too much pressure on the new joint."