What about walking, hiking and running? About the tendons et al: are you able to voluntarily move your shoulder out of joint? Can you bend your fingers and thu

What about walking, hiking and running? About the tendons et al: are you able to voluntarily move your shoulder out of joint? Can you bend your fingers and thumbs backwards? Would you characterize yourself as "double-jointed"? http://www.livescience.com/33186-double-jointed-people-hypermobility.html http://www.livescience.com/33186-double-jointed-people-hyper... http://www.wisegeekhealth.com/what-does-it-mean-to-be-double-jointed.htm http://www.wisegeekhealth.com/what-does-it-mean-to-be-double...