Just my time and a little money. Used to coach Special Olympics basketball mostly downs syndrom and a few autistic. These had been the lowest level players in the group. The joy all of them got just from getting the ball in a square that was tapped on a wall. These players ranged in age 10-36 years old. I really never knew who got more out of it, them or me. It was a great experiance for me, one that I'll always appreciate and remember.