Kevin Hart wants fans to hear it from him first: He has “got to be the dumbest man alive!!!”

In a hilarious profanity-laced video shared to his Instagram page on Wednesday, the comedian explained why he is currently using a wheelchair. Hart, 44, recalled how he attempted some “young man stuff” — a.k.a. trying to race his friend, former NFL player Stevan Ridley, in a 40-yard dash — and wound up injuring himself.

“Ladies and gentleman, the age 40 is real,” Hart said. “All my men, women out there 40 years old and above, it’s not a game. Respect that age.”