I notice that when I stride a few inches more towards the plate, my elbow tends to take less strain. I had elbow problems for about a year, and I started striding a little farther the past month. Seems to work like a charm. Now my arm still get tired after a while (who's arm doesn't), but it does not hurt anymore after finish my pitching routine. It use to hurt almost every bullpen I throw (I'm not in a league, but I throw quite often after work). I do feel abit of soreness from my shoulders afterwards though. I may be soreness from not being worked because I understrided while pitching, and it just needs to build up in strength.