Box-jumping is a pretty popular challenge at the gym - it blasts calories, builds strength in your legs and adds a bit of light-hearted competition to your workout.
But the chances are, you won't see someone try a 40" leap while holding a pair of 70lb dumbbells.
That's what Shawn Oakman, star of US college football team the Baylor Bears, does in this video as he makes us feel a little less proud about our box-jumping boasts...
https://instagram.com/p/24DxeajBq9/
