I broke my left clavicle about 4 years ago (in my mid 30's) and I was given the option of surgery or letting it heal. I choose the healing option and was told to move my arm around in 3 positions often (behind my head was the one I remember). After about 2 weeks, I setup one of my vintage mountain bikes with upright north road bars, but the little bumps in the road would cause discomfort. I started riding that bike after about a month and only road that bike for about 1-2 months before riding the others.