i can see aderall helping your workout.... just as people take caffeine to have more energy during a workout. it gives you just that: energy. it doesn't build your muscles up, so i think if you used it all the time you would find yourself in the same situation as if you didn't use it at all, see where i'm coming from? plus, then if you don't use it, you will automatically have a shitty workout.
the only danger is if you need to take it to work out. taking it on rare occasions is one thing, but the problem with a speedy drug is it's easy to justify its use; people get tired quite often. so if you "only use it when you're tired," that can turn into something worse. i've seen it happen to people, and it ain't pretty. but i'm not preaching, and it doesn't happen to everybody.
the danger i see with snorting a time-release capsule is that a higher dose is hitting you than is intended, even higher than if your just ingested the crushed up pill. you run more risks when taking it that way. plus, after time it will screw up your nasal cavity. I wouldn't advise snorting it... that shit burns really bad too doesn't it?
so in short:
yes, it gives you energy, so it will probably help your workout. however, it doesn't build your muscles up as far as i can tell.
regular use probably will not make you stronger than you otherwise would be, and you are risking addiction that would really suck.... speed addiction is one of the worst kinds.
personally i think the costs outweigh the benefits, but to each his own...