From Zac Efron to Mario Lopez, see these sexy stars take their shirts off
The Guardians of the Galaxy hunk (pictured here in Kona in April 2015) dropped close to 60 pounds in six months for his role in the action flick in 2013. According to his personal trainer Duffy Gaver, Pratt was so dedicated, he even did extra workouts beyond what was planned. "Chris' athleticism is amazing, he is incredibly disciplined and his work ethic is phenomenal," Gaver told Men's Fitness. "He isn’t the client you have to push; He is the type of client you have to pull down. If you were to walk into the gym when he was training, you would have thought for sure you’ve got a guy getting ready for the NFL Combine."