How to sit correctly in front of the computer

[Solutho]

lol, bro you and I are the same... When I am ill, my mom says don't eat this and don't drink this and this bla bla... but I say, just forget it...

I kinda agree. I find it really boring and uncomfortable to sit all straight up, despite having an ergonomics' class.
Life's short, enjoy it the best you can. If you don't bother somebody else, just do whatever you wanna do.

And again... have fun!