In my early 20's I was sharing a room in a barracks with another E-6 in a US Navy school. This guy was as fit as one could be. He introduced me to a book at which time I purchased a copy.
The book: The Royal Canadian Air Force Excercise Plans For Physical Fitness.
I paid $1.95 US for it in 1974. This is a paperback book not hard bound.
Until I looked it up online just now, I thought I would purchase a new copy. Currently there are 2 new copies listed at Amazon:
1 for $646.05
1 for $838.12
Instead of investing in stocks and bonds, I should have invested in books.
I will learn to work with the 40 year old copy I have. Scotch tape is cheap.