The key to a "runner's high" is marijuana, according to a new book

Journalist Josiah Hesse wrote "Runner's High: How a Movement of Cannabis-Fueled Athletes Is Changing the Science of Sports." In the book, he argues that cannabis is changing the sport of distance running.

"The 39-year-old journalist contends that pot makes for a more focused and relaxed athlete, creating a positive-feedback loop around exercise that can lead to improved performance.

The thorny subject of athletes and pot took center stage this summer before the Tokyo Olympics, when Sha'Carri Richardson was suspended from the U.S. track and field team after testing positive for the banned substance."

Wall Street Journal

"Any endurance runner will tell you, there's a kind of hypnotic, meditative state you get into after a certain distance, there's a rhythm and deep focus on your body. That's something that cannabis also provides and harmonizes with very well. What I hear from athletes is that it gives them a dialed-in mind-set where everything else disappears. They often can enter a more playful, present state."

Josiah Hesse in interview with The Wall Street Journal