How to improve left hook?

This can go on forever, literally.

Honestly, the most scientific explanation explaining every single movement and how much % weight on each foot, and exactly at what point, will only serve to confuse you. It is pointless.

The only people that can actually help you with a hook, are A-yourself (once you do it right, the feeling is unmistakeable) and B- your coach. He can tell you if you're doing anything wrong.

I don't know why people ask this question on message boards expecting an instruction manual on how to do it, and why people pointlessly argue this back and forth.

Newsflash, this is not helping anyone, and it always turns into a "dick measuring" contest.

 

....and my dick is pretty big....but my balls are HUGE!

 

Train like your right arm is broken for about 3 months.