Learning to reduce the impact of some mountain bike crashes, Part 1: sliding out sideways

Update 3/26, 7 am CDT:

This blog post, originally published on March 22, has now been published on Singletracks.com with a slightly revised title and a major addition of a narrated video/screencast at the end. See:

Learning to reduce the impact of some mountain bike crashes, Part 1: sliding out sideways