She had the perky, jaunty quality of someone who could instruct her nervous system to manufacture endorphin and adrenaline at will.
"Down and Out in the Magic Kingdom"
Cory Doctorow
Because I make such a point of getting in my workout every day, my husband has accused me of being an endorphin junkie, and he is right!
"How and When to Be Your Own Doctor"
Dr. Isabelle A. Moser with Steve Solomon