Is Inner Engineering a Teaching Tool or a Physical Device?

Born and raised in India, Sadhguru says he spent his childhood and adolescence as a "super skeptic" who didn’t grow up "with anything spiritual or religious." He spent his days crisscrossing the country on his motorcycle, he launched successful businesses, but then he had an experience in his 20s that changed the direction of his life forever. Sadhguru is now a world renowned yogi and mystic who talks about how ancient yogic practices can be relevant and helpful in contemporary times. He's the founder of the Isha Foundation and the author of "Inner Engineering: A Yogi's Guide to Joy."