I've been running since '94. Ran several marathons and typically run 40 to 50 miles per week, with a long run in the 10 to 20 mile range. Obviously it is great for overall health and well-being. Keeps me mentally focused as well. I don't mean to be harsh, but looking at the YouTube videos with some incredibly talented trumpet players, I'm not seeing a correlation between aerobic conditioning and brass playing. There are other factors that contribute more directly to playing a wind instrument. Maybe the time I'm out running the trails, these super talented trumpet players are spending that time practicing more. Guess you really can't have too many obsessions going on simultaneously.