Fencing

During your swing / lunge / twist, it is extremely important to be doing the inner corset to offset the strains (symmetric and asymmetric) to your joints, discs and nerves. I also think that the stretchsitting and stretchlying I advocate become especially important to offset / safeguard against any disc/nerve compression. As far as asymmetric muscle development goes, I don't think this is a problem. As long as your bones and joints are not getting pulled out of shape, it's okay to have more muscle on one side than the other. I use these activities as examples that if you keep the asymmetry to the muscles (and not take it into the baseline position of your bones), there isn't a problem with asymmetric activity. After all, we have been napping stone tools, throwing projective weapons and cleaving meat and tubers asymmetrically for millions of years - I believe we are well-adapted to handle asymmetry. We just need to do it well and have enough length in our spines to tide the relatively short stretches when we are asymmetric in our bones.