Training for strength and body stability without free weights is a bit like training for a cycling race while using training wheels; you're missing out on a fundamentally important aspect of training. I don't know how Joubert Syndrome affects your weight training, but my advice is the same as CrazyFools; start on low weights, and consult a coach or other gym patron for help with form.
I'm an aspie, and I wouldn't exactly be a dancer even if I wasn't. But I can tell you that strength training didn't really take off for me until I learned to use free weights, and felt how much stronger my core became. And now I'm in a CrossFit club, where proper form is paramount, and I'm now realizing how much I've gotten away with raw strength making up for bad form. So do consult a trainer, and resist the urge to put on more weight until you've got the form down, at least to a reasonable degree. Good Luck!
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