I bought this book in 1985 when I had very bad back pain from doing heavy landscaping work (lifting, using a sledge hammer, etc.) in my yard. It's by Alexander Melleby from YMCA. It's their exercise program. My job was and is computer programming so I sit a lot at a terminal which doesn't prepare me for strenuous exercise that stresses the back. I sought medical help for my back pain, but after discussing surgery and rejecting it, the doctor offered me the choice of an expensive exercise program, or I could buy a book like this one and do the recommended exercises. Exercise is necessary because the back is almost entirely supported by muscles and good muscle tone is essential for a healthy back. I tried the expensive exercise program for a couple of sessions, and the instructor offered me the same choices as the doctor. Buy the book and do the exercises on my own or continue paying a lot of money for physical therapy. I bought the book and it worked well. The exercises made me limber and back-trouble free. You have to do about 15 to 20 minutes of exercises every day, but it's worth it. When I backslide and skipped the the exercises for a few months, my back problems eventually come back. This book is good but the YMCA has a new book "YMCA Healthy Back Book by YMCA of the USA" which you may want to consider. It's roughly equivalent.
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