Retired Navy SEAL Andy Stumpf discusses his new book 'Drownproof: Eight Life Lessons to Keep Your Head Above Water,' revealing why SEALs drown despite water training, the critical importance of fundamentals in jiu-jitsu and life, and how exceptional people surround themselves with other exceptional people—not dipshits. Most exceptional people achieve success through the influence of their mentors and peers, not alone; isolated excellence without a strong support network is nearly impossible.