Zac Efron was walking around shirtless, and doing pushups between takes, on the set of The Death and Life of Charlie St. Cloud over the weekend.

Oh, and Zac was delivering a package wrapped in blue sweat pants.

Zac Efron spent some time without a shirt on in his movie 17 Again.

Below is almost 10 minutes of the movie, which looks fun.

Zac Efron told USA Weekend in an interview:

"My parents really kept us anchored. I played sports on weekends — baseball, basketball — and when I sucked at those, I started playing golf and ping-pong in the garage. After I lost interest, I started singing. I was always singing to the point where my parents would shout, ’Shut up, Zac! Enough already!’"

We’re just as glad as Zac’s parents that he’s decided to do more dramatic acting, and is taking a break from musicals.

Since Zac loses interest in things so often, we’re wondering when he’s going to lose interest in Vanessa Hudgens.

Zac Efron’s Uncle Hank and his girlfriend, Randi, crash Zac’s pool party and they just can not be cool.

Also at the faux party was Thomas Lennon, Nicole Sullivan, Justin Long, Brody Jenner, Nicole Richie, Joel Madden, Jessica Stroup, Brittany Snow, Carmen Electra, Queen Latifah, Lance Bass, and Abby Pivaronas. Vanessa Hudgens is there too.

Steve Wozniak, cofounder of Apple, and former Dancing with the Stars castoff, appeared in a Jimmy Kimmel spoof showing him as the Zac Efron replacement for the Footloose remake.

We never knew Steve had such a great personality. Guess in the second half of his life he is really cutting loose, foot loose.