Long ago and far away, a fourth-grade teacher told a student to "stand up straight - you look like a pretzel". The unthinking adult only offered criticism. The child was left to try to unkink himself in the ways that probably caused more structural damage. Most of us think good posture involves thrusting

We all know people who get up with the first rays of the sun. Some people wake up even earlier, bouncing out of bed before there is even a glimmer of Homer's famous "rosy- fingered dawn" in the eastern sky. In contrast, for many people leaving the confines of their comfortable bed is a daily exercise