My wife, Esther, and I traveled in the spring of 2007 to the Greek island of Lesvos, where we filmed a three-week yoga workshop by Victor van Kooten and Angela Farmer. In addition to the one-hour documentary, “Underground Yoga” includes a series of instructive “asanas,” plus interviews with Victor, Angela and their students. (Bill Gentile credit: Video journalist, producer, director.) (Esther Gentile credit: Video journalist, producer, editor.)