Unconventional Training, Steel Mace, Battle Ropes, and More, Onnit Academy
Fall in love with sleep, and make it a priority. 7 Secrets of People Who Get Enough Sleep
The Navy knew well that most of the qualified and motivated candidates who started the SEAL training didn't finish. Most quit and they wanted to know when and why.
It turned out that the vast majority didn't quit when they were out braving the cold, wet or otherwise inhospitable conditions. They didn’t quit in the middle of the demanding and stressful exercises. Most quit over breakfast or lunch. They quit in anticipation of the difficult conditions to come. They self-eliminated, not because they didn't have the abilities to perform the tasks, but because they feared that the coming challenges would be too difficult and they would then fail (and fail in front of their classmates).