WATCH: Sonny Bill Williams shows he’s a MONSTER in the gym

Sonny Bill Williams will be back in an All Blacks jersey this Friday and he’s been proving he’s still a beast in the gym.

A little bit of fun today #gettingthereslowly ✊🏽

A post shared by Sonny Bill Williams (@sonnybillwilliams) on Jun 14, 2017 at 1:50am PDT