Stew and Jeff discuss a great question we received:

Could there be something physiological making BUD/S more doable for some than others? Maybe a certain ratio of slow twitch to fast twitch muscle fibers? Or is it really 10% physical 90% mental? What does that even mean? If it is mental, what mental training does one need to make the physical happen. I appreciate your time, sir, and I look forward to your reply.

Jeff Nichols - http://www.performancefirstus.com
Stew Smith - http://www.stewsmithfitness.com