Mountain biking 1:00:00  8.0 km (7:30 / km)
Group ride w the GBNEMBA gang at Beaver Brook. Left my gloves at home, but otherwise was OK for the first hour or so, including up and down to the water tower. One of the practiced skills was going over a branch/log, maybe 5" diameter. No problems.
Then, I failed to negotiate a branch, same size, went end over, and landed on my shoulder. Fast forward: fractured clavicle.
I'm extremely fortunate not to have landed primarily on my head or neck.