For the 2009 Oscar-winning flick The Fighter
, which took a look at the early years of boxer "Irish" Micky Ward
, Mark Wahlberg
spent four years ‘building his boxer bod' with his trainer Brian Nguyen.
"Most great fighters like Mark have the ability to transfer force from the lower body to the upper body. The Rotational Med Ball Slam allows the fighter to not only use the hips and the lower body as it stabilizes ground force, but it helps works the obliques and upper body while delivering a powerful explosive movement as the hips rotate and the ball is thrown to the ground," Nguyen says.
Wahlberg also did lots of lunges, kettlebell exercises, and lateral walks while working with Nguyen.
"It's a bit of a Rocky thing… We go to the gym at 5 a.m. when it opens. I'm jumping rope, hitting the speed bag, the double-end bag, the mitts, and we're sparring a little bit," Wahlberg told MTV back in 2007.