Martial-arts virtuoso and instructor James Sherman earned an official certification from the revered Israeli Krav Maga Association after completing more than 500 hours of close-quarters combat training in Israel. Sherman, who has received attention from Time Out New York, leads groups and individuals—including executives and celebrities such as magician David Blaine, singer-songwriter John Mayer, and BBC America president Herb Scannell—through the rigorous self-defense regimen, which includes potent kicks, punches, strikes, and chokeholds designed to ward off bullies, violent attackers, and amorous ivy vines. In addition, Sherman illustrates how Krav maga's cardiovascular intensity can bolster students' strength, speed, and flexibility.