So I was at work and this guy I work with does some mma. I'm not a big guy and he's always practicing on me. He tried choking me out from behind and he was freaking out because I could still breath. He tried other ways and the only way to get me to tap was to lift me and put all my weight on my throat. He said he'd heard of people who were impossible to choke but didn't believe it. I've gotten some of my friends to try to and they can't either. Is this actually something known to mma or what? I've never worked out my neck muscles either and havent routinely worked out in more than a year.