LIST: 5 rugby stars who suddenly bulked up

And that means more work in the gym, sculpting their perfect bodies and lifting heavy weights to gain extra muscle.

But these stars didn't always look like body builders.

In fact, these rugby stars have enjoyed a remarkable body transformation over the years, and definitely didn't skip leg day.

The Wallabies legend started out as an skinny 78kg teen who worked day in and day out to transform himself, with his size and strength came at a cost, Pocock told Australian Story.

The former Wales flanker worked his arse off to become one of the best players in the world with a body to match. He's now set up the

SW7 Academy

, which is an online training program that he's created in collaboration with his  long-term training partner, Josh Davies. With more than 30 years of elite-level training experience between them, they know what’s required to maximise athletic performance.