Shailene Woodley flexes her opinions on staying in shape, feminism, stardom, Twitter and acting

One-armed push-ups come pretty easily to Shailene Woodley. She proved as much on the carpeted floor of a hushed hotel hallway recently, surprising a reporter with a welcome bit of spontaneity. It was a fitting bit of theater for her new film, "The Divergent Series: Allegiant," opening March 18,...