I don't think there is a way to avoid it without some retouching, but I don't think the reflection is obvious enough for most people to notice. I mean, you definitely see reflections, but they're indistinct enough not to draw attention away from the subject.
My first thought was the same as Rick and Melissa's- you'd have to clone or process yourself out somehow. But I suppose if you had the right kind of lens you could stand further back so that your reflection is indistinct or non-existent and take the shot from there. You may have to crop the picture in post-processing but maybe not if the zoom is strong enough. Just a guess. But I agree with Melissa- you can't really tell the reflection is a person- it's too indistinct. I like the placement of the balls- and the colors.
@asrai@digitalrn@reba I know cloning will replace the image but I am not skilled enough to remove me and leave the rest of the lovely reflection. I guess the real trick would have been to stand somewhere so I couldn't be seen.