in gymnastics, I was taught to roll - and aim for landing on the shoulderblades. Landing there means the body is already tucked in and the rolling aspect then is a pretty natural follow-thru.

But with the bike, I've always been clipped in on spills, so I end up landing on my thigh while still stuck to the bike. I can't roll that way!

Though I suppose at least I'm landing on my most padded part....