Stew Smith (https://www.stewsmithfitness.com) and Jeff Nichols (https://www.performancefirstus.com) discuss mental toughness. What it is and how to develop it fully through being consistent with your goals. 

For a one stop shop for mental toughness check out this article: https://www.stewsmithfitness.com/blogs/news/mental-toughness-one-stop-shop  (full of articles and multiple podcasts)

Check out other videos of combat swimmer stroke, workouts, and other spec ops related training.  See http://www.stewsmithfitness.com for more information about military, law enforcement, special ops, fire fighting training programs.