This one is on how to fight better and harder
Drop the tough guy act for a minute, or long enough to read this.
I am going to give some tips because I think there is a depressingly large amount of pathetic fighting in this world. I will also post some rules that I live by, you do not have to.
1. There is no definitive "punching muscle":
To improve punching power you will have to think a little bit, are you throwing a hook, a jab, or something else? For a hook you need to do some core workouts, it is really easy to find these and you should not have to much trouble doing so. For downward strikes you need to build lats, biceps, and shoulders, other muscles couldn’t hurt to improve but those are primary. For a forward punch triceps, forearms, biceps, shoulders, lats, core, shoulders and pecs, it sounds like a lot but even push ups will square off exercise for most of those. There is more but I will keep it basic.
2. Yes, it is a cliche but walk away if you can.
We all need to vent frustration and every guy on earth has a day or two when he says, "man I wanna f*ck somebody up." You win more by walking away, think of that dumbass standing there with his fists up feeling and looking like an idiot.
3. Despite number 2 you must be prepared for everything-Always.
I have walked away from fights and had people run jump on my back and smash me in the face with a brick having not been used to "street" mentality, you do not want this, be aware of your surroundings, listen, hear, feel. If they attack from behind they negate all rules, throwing sand is great in movies but will not necessarily save you in real life and wastes precious stamina, if someone puts there hand where you can reach it having broken fair fighting rules grab something (I have found a pen is very often available and useful) and stab them or if it is a blunt object run batter in, baby.
4. Si vis pacem para bellum
If someone threatens and is making it difficult to get away from the fight scare them, I have found MOST (note: not all, so it could get a little bloody if this fails) people will back away from something like a bike chain.
5. Strengths and weaknesses
Are you short and agile? Get close and low. Tall and clumsy? Far and out of reach.
Start with this and give me opinions and if more is wanted I will write more 
