TMZ has learned the UFC badass and Heidi Northcott agreed to do the revealing workout for a viral campaign for Reebok -- a company that Chuck already has a sponsorship deal with.
Still, hope somebody sterilized the equipment after the shoot.
Wanna party with Justin Bieber ... you gotta sign on the dotted line! We got our hands on the contract JB makes all his guests sign ... and it seems outrageous and totally douchey -- but maybe it isn't. We'll explain.Plus, Lil Scrappy dodges jail time by claiming he's…
Are you ready for this? Because if you're not, get ready for this -- Fishwrapper is ready to live…READ MORE