"sidedness" - right-side much less flexible than left

I have a problem with the right-side of my trunk.

Are there any specific links (or articles or books) dealing with sidedness? I have found nothing informative so far. Of course, I can make up my own sequence of exercises, but I would sooner examine any existing literature before doing so.

I think you need to be way more specific for whatever it is you are talking about.

Like, junk in the trunk or your torso 'trunk'?

Err, my trunk (i.e. that part of my body below the neck and excluding my limbs) is less flexible on my right side than it is on my left side.

Undoubtedly, the problem lies in the area between hips and lower chest (rather than chest-neck part of the trunk).

An example of one exercise that really shows this up is the classic Yoga half-moon posture (not the one you sometimes see, with one hand on the floor and one leg in the air, but the classic Hatha Yoga posture of arms raised above head, hands clasped, followed by bending the trunk, from the hips, to the side). 

I figured you meant that trunk, just making sure.

I've never heard of that, though. So, take this with a grain of salt(well, more like a handful), I wonder if it's a result of poor posture. I've never noticed flexibility issues myself. Though, I do catch myself having all my weight on one leg when standing, causing a bend in my torso. Also, even when sitting I tend to lean to one side. Maybe, you are doing this and it is causing the issue. Just my complete random opinion and guess.

That yoga pose you mentioned sounds like a good idea to fix it, unless it ends up being something more serious with your spine or something. Hope not. Good luck.

I don't know if this is the same thing but I have a weak right side and it is specfically due to my hip.  I goggled some exercises to help strengthen my hip and am going to work on those.  I am a runner and it is really affecting things, my left side is having problems from overcompensating for my weak right side and my right hip and ankle are hurting.  :(

Thoractic mobility issues can stem from as far away as ankle mobility restrictions, so it would be useful if you could do a self-screening for joint mobility all over, not just in the suspected problem areas. Gray Cook has done a lot of work on that and if you can find a trainer using his Athletic screening procedure you'll really have something.

 As a next-best solution  Mike Boyle outlines a Joint-by-Joint Approach to Training and has some suggested exercises in Essential 8 Mobility Drills - though I'm not too sure about that tennis ball thing; I prefer using overhead squats for thoracic spine mobility. One of the warmup routines I use a lot when I'm not doing something from "Magnificent Mobility" is the mobility complex which is a lovely lead-in to training of any kind ;)