Kratom ........why not Heroin 
GEEZUS,just fucking lift!!!!
Heroin is expensive and hard to get (it's all fent nowadays)! Just kidding. Kratom in reasonable, small doses in people not addiction prone may be fairly safe. Many take say 2-3 grams, but there are individuals who immediately jump to 60 grams a day chasing a high, or in the recent past it was possible to buy the synthetic 7-OH (mitragynine) found in small quantities in Kratom, which, the 7-OH, was for all intents and purposes perhaps rightly compared to heroin. I believe it was recently put into Schedule 1. I've used Kratom here and there for years until it disappeared from my usual source a while back. I managed not to get addicted even though I have an addictive personality (I think).
I admit I love drugs, I hope you bear with me or just scroll past these posts. There's not too many original posters here so perhaps there's room for different types. Me with my drugs and overly long posts, posters who only post "bro...", some obsessed with hands and upside down cups, some who are "for dicks" and trannies, crappy trolls, BHANKS! in the past and so on.
The reason psychotropics may be (are very IMO) relevant to lifting is that everything starts in the mind, any action. For example, a decade+ ago when Ephedrine was still available here it really helped my lifting. It just put me in the mood, increased motivation to lift and increased training aggression. Plus there might be a small strength increase. There is a reason pre-workout supplements are a huge business. It's because you feel them immediately. In the past whole supplement companies were built around ephedra sales, such as Twinlab. Dr Scott Connelly said, "ephedrine does everything you'd want in a dieting situation" and he wasn't even selling it. Even you probably "need" your morning coffee and maybe you also drink a cup before lifting? It's basically the same thing in principle

JMHO.
TL;DR
Kratom when used responsibly may make lifting more enjoyable relatively safely.