What is the opinion of Reddit about the
THE Complete Keys to Progress?

20 rep breathing squats 3 times a week and at least 2 quarts of milk a day.

Before you laugh, this program is from John McCallum who was a Firestation Chief and wrote articles for Strength & Health back in the late 60’s. He had a series of articles about exactly what you’re saying, a man looking to get in shape to be a better firefighter.

You can pick up that book I linked to that has the specific article in it, the articles are called “The Super Bulk and Power Thing” and it’s broken into 3 parts, or get a book dedicated to the program inspired by McCallum:

https://www.amazon.com/Super-Squats-Pounds-Muscle-Weeks/dp/0926888005/

This is a very effective program that works for just about everyone. 20 rep squats equals strength.