Karl kicked off the challenge and was seen furiously pulling on the weights for several seconds before reaching an RPM of 637.
It was then Cody's turn, and despite being half Karl's age, he couldn't beat the controversial TV presenter's efforts.
"He's not gonna get there! He's not gonna get there!" Karl jeered in the background.
He added: "Eat my s**t, Simpson."
Karl then laughed at the camera, clearly pleased with his fitness efforts.
Karl shared with fans that he was making some changes to his lifestyle late last year after taking the advice of a doctor.
"I was told a little while ago by a doctor I needed to make some changes to my physical health," he shared to his Instagram.
"It’s been tough. I was fatter than I thought. Ha. But I’m getting there. Slowly. I want to thank @osher_gunsberg for the inspiration.