Challenge: Another translation of 頑張って or 頑張っています。In English, challenge is mainly used in one of two ways. We would say, ‘I challenge you to a game of tennis,’ meaning I want to play you at tennis (because I want to beat you.) This is now somewhat old-fashioned. More often these days, we use challenge to describe something that is difficult, or difficult yet rewarding, e.g. ‘My new job is a bit of a challenge.’ チャレンジ is Japanese.