Wayne and Coleen Rooney's son Kai, 16, shows off his transformation as he lifts weights in the gym - after injury led to him cutting his season short at Manchester United

Kai Rooney showed off his fitness transformation as he shared snaps from his gym session on Tuesday afternoon. 

Wayne and Coleen Rooney's son Kai, 16, shows off his transformation as he lifts weights in the gym - after injury led to him cutting his season short at Manchester United
Kai Rooney showed off his fitness transformation as he shared snaps from his gym session on Tuesday afternoon.