I went climbing both Tuesday evening for about 3 hours then again last night. So, by the end of the evening last night I was getting kind of tired. I went to demonstrate something on a bouldering route that I've done lots of times, completely lost a hand grip, and fell. This was on an upside-down stair kind of section, so I landed almost flat on my back (impact points were, in order, tailbone, shoulders, head) from about 5 ft up. Now, a 5ft drop onto my feet is easy to take, but a 5 ft drop onto my back is quite a jolt. My neck support muscles are quite tight/tender right now, and I am being very careful in how I move my head/neck. Hopefully this won't interfere with my hiking & cottage plans for the weekend.