Dom is working with The Athlete's Foot and they gave him $500 to give away. So he came up with an idea - Chang vs Child in a 400m race.
The winner will walk away with the $500.
We've tracked down 12-year-old Reuben. He'll be taking on Chang this weekend. He's part of a running club and has won his school cross country every year for eight years.
Chang won't stand a chance. 😂