Over the weekend, Anthony Joshua lost his world heavyweight belts WBA, IBF, and IBO to Andy Ruiz Jr after a seventh-round stoppage brought an abrupt end to his professional record at Madison Square Garden. The British/Nigerian boxer was floored four times before the shocking fight was finally ended. And in his first Twitter post in the wake of the defeat, Anthony Joshua shared a new photo of himself showing off his buff arm and wrote: 'Don’t let success get to your head or failure get to your heart.'