Heavy lifting.
My experience now is that it’s entirely unnecessary.
Lift heavy upper body, then train legs with the same weight.
Heck, the training effect, you can get it at just 70-80% 1rm, even less, meaning you don’t have to lift heavy most of the time for upper body either.
Dude, you respond stupid well to FEELING the muscles fire (to the point you think you’ll fall over/look woozy/drunk/out on your feet) with silly silly light weights.
Say you REALLY want to do a heavy squat…
Well if you’re limiting yourself to bar weights you can clean and press, better be able to press it.
500+ lbs has been done.
You want to squat 405?
Earn it by having built yourself to living beast mode by only doing it after you’ve cleaned and pressed it.
Press a number, then you’re allowed to hit some back squat 10s or something with the same weight.
Bro, get to the 300lbs weight set like this, THEN evaluate what equipment you “need”, what gym you would “possibly” go to, etc – you’ve won the big & strong game.
Persistence & Tenacity