Yeah, every weight training or fitness book covers this in the early pages.
Startled me to this day to hear people avoid basic knowledge and run with misinformed takes.
We live in a world filled with gimmicks, misinformation and marketing. Unsurprisingly people miss the absolute basics out that no one mentions now and then wonder why they don't get the desired effects.
Its amusing how everyone wants to be like someone else whilst paying no attention to themselves, their lifestyle and what their own body is telling them. Curse of the Insta-era...
Sleep quality alone can make a hard gainer swole because that is when you grow and your body is awash in GH. Ironically people think slamming a GRRR WOOOOAAAHHHHH GRRRRRR HHHHHHHNNGGGHHHHHH preworkout makes all the difference when in reality it obliterates their chances of a restful sleep later that day, even if it feels great at the moment.
Will admit though those meth analog PWOs from back in the days that had you in the gym on Monday morning acting like it was Friday night in the club were amazing. Roll up in the spot like:
And be feeling like you want to lift up the entire gym
with all the people in it was something else until you realized they were actually tubs of crackhead strength marketed at bodybuilders.