Nicely articulated. Personally, yoga to a sound track will keep me away from any class - but a really good teacher (hard to find in general) who knows how to structure a class well, will help push the shadow's edge in a way I could not alone. That being said - self practice remains the most meditative and rewarding, but self discipline, lack of inspiring climate and landscape (London!) are my nemeses! But I feel duely encouraged - thank you ;)