Caffeine
Other
Boosting mood and motivation during the Yukon river swim
"Even playing with caffeine on the Yukon swim, we were getting into the grams towards the end of the swim. And that again, it just enabled me to be so much happier doing such a mundane task... My shoulders are hurting. 400 milligrams of caffeine, 15 minutes ..."
More source quotes
Daily stimulant
"I love caffeine. I have a high caffeine tolerance... Caffeine is an everyday thing, unless I'm carrying some sort of respiratory infection... Caffeine is a beautiful thing. I back it and it backs me."
Increasing alertness and focus before cognitive work or workouts
"If you want to increase alertness and focus, caffeine is a potent way to do that. It works. ... I do often combine that with some caffeine, not in capsule or pill form, but rather in the form of a cup of coffee or yerba mate."