It was just that, it was the "I'm going to write a post covertly bragging about doing 15 pushups."  I'm actually very much an advocate of reducing stress on joints through strict form and full range of motion. I can make 15 pushups difficult if I wanted to, but I would bet lots that this guy just dropped and started doing the "as fast as we can go" pushups like a college kid at the NFL combine on the bench press.