Source: Born to Run: A Hidden Tribe, Superathletes, and the Greatest Race the World Has Never Seen
“Have you ever been really scared and then your muscles relaxed? Being scared is just one relaxation of muscles, an orgasm is the contraction and relaxation of muscles over and over. then afterward, you are really sensitive to touch. your toes are tingly, heart rate is really high, you're all hot, you cant focus on anything other than the feelings coursing through your body.
its all warm, wet, hot, a sensory overload really.”
Related quotes

page 119
Illusions : The Adventures of a Reluctant Messiah (1977)
Source: Illusions: The Adventures of a Reluctant Messiah

“The heart is a very, very resilient little muscle. It really is.”
Source: Hannah and Her Sisters
“If you are an intellectual, your best course is to relax and enjoy it.”
A Voice from the Attic (1960)

“You cannot be really first-rate at your work if your work is all you are.”
Source: A Short Guide to a Happy Life

"The time of his life", in The Guardian (7 June 2004)