We need endurance. I'm climbing mount whitney in a couple of weeks, which is the tallest mountain in the lower continental united states. And so i've had to build a whole lot of different muscls to build the endurance to be able to climb that mountain. My trainer has got me working on muscles that ave got nothing to do with my biceps. But there those are the muscles that are going to help me get to the top of that mountain. Even if people look at what nick and i have achieved with a 21, or with propel women, or perhaps with my speaking around the world, ir technically, i'm only half way.