Wayne Rooney’s son Kai, 16, lifts huge weights in gruelling gym workout after Man Utd season cut short by injury

WAYNE ROONEY's footballing son Kai showed off his bulging biceps during a gruelling gym workout on Instagram. The youngster, 16, who is currently on the books of his dad's former club Man Utd, missed the end of the season with a foot injury. However, the teen hasn't been resting on his laurels, as these latest...