This story is part of Fit and Fun at Any Age—a seven part guide to live a longer and better life. FOR CHARLES STOCKING, long ...

When the deep stabilizing muscles of the shoulder ... leading to stiffness and discomfort. These imbalances are common in people who spend long hours sitting at a desk, hunching over devices ...

Well, you may regret it, because if you get too toasty under your duvet, you could wake up with stiff muscles. But how so? Doesn’t heat relax muscles? “If you start to perspire, you could push ...