Bodywork can be used like you're thinking about it. ART hasn't impressed me so far by what I've read about it and what I've gathered talking to the people who do it.
My issue with ART (I'm a massage therapist going back to school for physical therapy) is that they will train personal trainers to do it and they don't have the backround (most of the time, I'm sure there's an exception somewhere) to be doing this sort of work. It's basically just deep friction to your muscle attachments to help realse or realx it.
Rolfing is structural integration and in theory most everyone would benifit from it. No one has perfect posture. Rolfing can be pretty hardcore too. In it's strict form, it's a series of 10 sessions that follow the same progression on everyone. There are different schools of Rolfing now and some people use it more as a technique, like deep tissue or myofascial work. The strict Rolfing also has to do with a somato-emotional release and some kind of hippie stuff like that.
Deep Tissue can be used at all point of your training if you think you need it. Except if you're going to be in some kind of a race or event, you don't want to have it done too close to the day because you can be pretty sore for a day or 2 afterwards.
So anyway, bodywork and massage is great to add as a part of your training. It helps with the recovery. If you are going to look into ART, I'd be especially picky about the person doing it and look for more of a PT, ATC or very good LMT.
Hope that helps.