4 stretches you should be doing (but aren't): Did you know your neck crick or shoulder ache may actually mean you're tight somewhere else? Troubleshoot your sore spots and work out the real pain points in just a few minutes a day. | Health.com
Knee pain can be the result of injury, as well as from mechanical imbalances and other problems. In fact, knee arthritis is the single greatest cause of chronic disability among US adults age 65 and older.