The 45-year-old actor took a break from filming "Grown Ups 2" to shoot some hoops with a friend.
Despite their height difference, Adam played some pretty aggressive defense and took some good jump shots. For someone who plays a lot of schlubs, Adam is pretty fit!
Check out all the photos below, plus other stars getting their fitness on, including model mommy Alessandra Ambrosio (who just gave birth!) and ripped R&B star Ne Yo.