this year david culver will take us to pamplona. >> it's a bit terrifying because you're starting to think, i'm committed, i'm on, i'm going to stay on. as we gather as a group we kind of find our positioning. it's crazy to think that you're standing your ground after first the bells and then that rocket goes off. and you're holding your ground. i'm listening to dennis's command. >> and cnn's david culver joins me now. david, what was the experience like? would you do it again? >> reporter: it was wild and no. yeah, once is definitely enough, jake. it was, you know, kind of a game-time position for me if i would actually run. i thought as we were going through this assignment we wanted to understand the cultural traditions behind it, why it's lasted after so many centuries. when you're there, you start to feel the adrenaline and the crowd's momentum. there's really eight days of running. day one i watched. day two, sure, i'll do this. i ended up i think satisfied that once was enough. physically i couldn't do anymore after that. it was something that i think so many people look at it