Junior’s skiing performance improved (to the the point of being an age-group national champion) thanks to music. Regular live performances gave his confidence a boost and helped him turn stress to his advantage rather than going to pieces.
Having competed in motorsort amongst other things I tried to explain a state of “positive stress”, the music was the way he found out how to get there. “positive stress” is when everything works beter because you’re stressed – better concentration, faster reflexes, more powerfull muscles, better cordination. It’s being fired up and ready to go but with the fear part under control.
So I suggest music, theatre or anything that’s put him in a situation where he has to perform in front of an audience.