Mark Zuckerberg hit the gym hard this morning with his personal trainer ... his 16-month-old daughter Maxima ... and she kicked his ass pretty good!
The Facebook honcho strapped Max (who were guessing weighs about 25 pounds?) to his back for a set of pull ups (he got 5) and some push ups (he got 14).
Zuck commented, "As soon as I finish she yells 'More! More!' Easily the most demanding trainer I've ever had."
Watch your ass, Jillian Michaels.
