Re: "About 90% of boxers in this country in my opinion, lead unprofessional lifestyle
There is a standard framework to the type of lieftstyle / training you should lead if you are a professional boxer / athlete.
If you do it properly you will be better than your rivals, if you take shortcuts you wont.
Im not saying you will become a champion, but you will have a much better chance of as your body will be in a good condition all the time, it then comes down to abiltiy /skills.
Make sure your fit enough and then hone the skills, no point in having one without the other (either way)