I quit doing alot of hard stretching. I would stretch alot on the 1st tee, people would comment on my flexibility (not that I think its all that great, but better than average apparently). Stretching too hard, I would start to really tighten up after several holes, and I'd have to keep stretching throughout the round. Lightening up my stretching routine is something that I think has helped me stay looser, if that makes sense.