Hiya! I know what you meen, I have a little SJ pony mare, 23 years of show jumping!

• try grooming him
• leading him
• backing him up
• bareback
• monty roberts techniques will keep him interested too.
• Massaging him (you can learn how to do things like t-touch on youtube)
• Doing lots of transitions like walk to trot, trot to canter or halt to trot etc etc
• doing circles or serpintines, figure 8s and other shapes if you are having a lesson

I hope I helped- I find doing what the horse really enjoys (apart from eating) is allways something to do to keep them interested too!!!

x