Stephen Colbert Puts on a Push-Up Clinic For John Oliver’s Push-Up Challenge For The Troops June 30, 2015 Uncategorized for the troops, john oliver, last week tonight, push-ups, stephen colbert, the late show Apparently, John Oliver issued a challenge to Stephen Colbert to do push-ups in dedication to the troops. Though we’re not sure exactly how that works, it made for this great video of Colbert showing us all how to do a “flawless” 20 push-ups.