British boxer Anthony Joshua joins Jessica Ennis-Hill for a gym session

British heavyweight boxer Anthony Joshua teamed up with fellow Olympic gold medallist Jessica Ennis-Hill for a gym session on Friday.

The 25-year-old, who took gold at London 2012, posted a photo to Instagram of the pair trying to look tough while working up a sweat.

Alongside the picture, Joshua wrote the caption: "Training alongside one of the baddest women I know, apart from my mother."

Joshua next's fight is scheduled for September when he takes on Gary Cornish for the vacant Commonwealth heavyweight belt, while heptathlon star Ennis-Hill is preparing for the World Championships, which get underway in Beijing next month.

A photo posted by Anthony Joshua (@anthony_joshua) on Jul 31, 2015 at 5:16am PDT