Evaluation of an exercise program for back pain.

A six-week exercise program for people with low back pain was established at YMCAs throughout the United States. Classes met twice weekly with trained instructors. Participants exercised at home as well. About 80 percent of the nearly 12,000 participants reported a decrease in discomfort, including those who had previously undergone back surgery. A decrease in pain correlated with adherence to the program and with measured improvement in strength and flexibility.