How do you react in moments of extreme pressure?

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I was recently keynoting at a company when the presenter before me (an ex-Navy SEAL) took the stage to discuss the importance of succeeding under extreme pressure. It was a topical comment, as this particular company was about to go through an intense period. He shared an training overview video from the Navy SEALs detailing a particularly onerous part of their training–what’s known as the underwater competency test.
Source: Navy SEALs Use These 4 Psychology Tricks to Succeed Under Extreme Pressure | Inc.com