Why Fletcher remains in top form?

Here's a tip as to why ILB London Fletcher remains a solid player at 37 years old: his competitiveness. He pursued QB Robert Griffin III on a bootleg and ran him out of bounds. Later, during a two-minute drill, he was ticked off that the clock wasn't stopped after he said the defense forced a running back out of bounds. He shouted to stop the clock several times and implored defensive mates to not get beat.