You may want to look at some of the David Goggins videos on Youtube. A side from being a stutterer, he was also obese and came from a disadvantage home life. He refused to let any of that impede him and became both a Navy Seal and Air Force Tactical Air Control Party member. He has since retired and become an ultra-marathon runner and public speaker. ​ [https://www.youtube.com/watch?v=yErh67ls9XA](https://www.youtube.com/watch?v=yErh67ls9XA)