The need for good posture never goes away. In fact, it becomes even more important as we age and develop age-related diseases, particularly arthritis. "When you maintain good posture, it puts the least amount of pressure on the joint surfaces and it allows them to work at their optimal level," says Brenda Robbins, a McKenzie-credentialed spine physical therapist at Cleveland Clinic. Given its benefits, its important to know what good posture is. Think about the old-fashioned image of walking with a book on your head, with the body perfectly aligned from the top through the back and down the hips and legs. Thats good posture, Robbins says.