I find this book called "You Are Your Own Gym" and right at the beginning, I found this...

"THE POPULARITY OF TRAINING EQUIPMENT, systems, and fad diets is mostly the result of
marketing—not a genuine attempt to help a generally out-of-shape society reach higher lev-
els of fitness and well-being. In this age, where our homes and gyms are cluttered with fit-
ness gadgets, the simplest and most effective method for developing strength and losing fat
has been largely overlooked—knowing how to train using nothing more than your body."

This far I've come... 

I uploaded the torrent to nostr:npub1v0lxxxxutpvrelsksy8cdhgfux9l6a42hsj2qzquu2zk7vc9qnkszrqj49 's https://dtan.xyz/