It is worth noting that while Eric Helms is the author of the Pyramid books, the training style is often compared to the famous program by Dr. Layne Norton or PH3 by Jordan Syatt.
The pyramid training concept is based on a hierarchical structure, with four phases: the muscle and strength pyramid training pdf free link
Check WorldCat to see if a local university or public library has a copy you can borrow. If you'd like, I can help you: It is worth noting that while Eric Helms