A collarbone is a common injury for mountain bikers. The bone takes little force to fracture, and bikers often find themselves falling on their shoulders. It is good practice to carry something that can act as a sling in case a rider ever fractures a collarbone.
This video is also a good reminder of the added safety riding with a group brings. If you insist on riding alone, it is always good to give friends or partners a description of the route you will go in case you get injured.
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