I was watching October Sky and it reminded me of a film which a wheel-chaired kid aspired to go into space. And there was a lot of pool activities that was simulating space walking. I think he almost drowned once... maybe not.

Haven't seen it, but maybe Walking on Air (1986) (TV) ?

It as to be it. Thanks a million!

An after school movie with a touching, yet unrealistic (not a true story) way of stating that if you want to be something you can.