During the beginning of some of my workshops, I have given Cliff Bars to athletes as a reward for participating. Its a good way to break the ice and get people talking. Especially if the workshop is right after they train and they are hungry.
I haven’t given any other token reward, but I like the idea of naming an “Athlete of the Week.” I think it would motivate athletes if their picture were taken and posted in the locker room or somewhere everyone could see. It might work well if the Athlete of the Week were nominated by the team rather than chosen by the coach or consultant.