Having spent years coming down the wrong way, I have had to completely re-style my running stance. Essentially, I was leaning back too much to try to regain control. This buts your back into hyperextension (arched backwards) and puts severe pressure on the joints at the back, the facets. These eventually give out and cause pain. Now, I have to consciously lean forward when walking and running just to maintain a 'normal' stance. When I first started descending this way, it felt weird because I always felt I was going to fall forwards. After a while, it became more natural and I realised that my legs were not getting so trashed. Granted, it does not seem as fast but that is more likely due to decrepitude. Looking at pics of Joss, this seems to be what he has perfected....a knees bent, leaning forwards downhill dash, much like our little black friend a few inches up and to the right!