juggling.tv

I've been juggling for a about a year and a half, and had 5 balls down (I thought) about a year ago, but now I'm having problems with my form. I'm having pain in my right shoulder and arm after a few hundred catches of 5 objects. As a side note, I do have some kind of muscle problem with my right shoulder now. I'm not sure if it's caused my by my bad form, or causes it, or is completely unrelated. I've been to a chiropractor 3 times now for it and I'm just wondering what to change. Thanks.