"Back to basics: Good posture"
 

Back to basics: Good posture
Poor posture -- such as slouching, rounding the shoulders or holding
the head too far forward --can result from an acute injury such as
whiplash, a sedentary lifestyle, occupational demands, aging, and
unbalanced exercising that focuses too heavily on one part of the body.

at http://www.washtimes.com/metro/20050...4526-2919r.htm