Despite its release date being pushed back to May 6, 2016, the two stars of "Batman vs. Superman" are wasting no time in getting into superhero shape. 

We already knew that Ben Affleck, set to don the cowl as Batman, was engaged in some heavy lifting, but we finally have confirmation that "Man of Steel" star Henry Cavill has also been back in the gym.

"Henry came in December because it’s over Christmas and to show you the type of dedication that Henry has, he came in over Christmas because he knew he was going to start shooting the movie Batman vs. Superman and start training for the movie in January," shared Robert MacDonald, Training Director at Gym Jones in Salt Lake City, Utah, with MovieHole. "So he wanted to come in December to continue his training. He didn’t wanna take time off at Christmas."

MacDonald, who helped train the actors in the new film "300: Rise of an Empire" added that he was not only impressed with Cavill's dedication, but also his genuine physical strength. 

"I would say that his fitness is progressing every single day," he said. "And not just in terms of looks, but also in terms of what I call real, genuine horsepower. I think people, even in the exercise world, would be shocked with what he can actually lift, what he can actually do. The things he is capable of. He doesn’t just look good. It’s actual real, genuine fitness which is really nice."

As we profiled extensively last year, Cavill spent 11 months bulking up from his ripped physique in "Immortals" to Superman-size for "Man of Steel;" packing on 20 pounds of muscle and averaging at times a 5,000 calorie per day diet

"You’ve got to eat protein first, then a little bit of carbs … you’ve gotta keep your hunger levels going," he told Total Film. "I’m training two and a half hours a day, pushing my body beyond its normal limits, putting on a lot of muscle mass and just making myself look like Superman.”

Related on MNN: 

The opinions expressed by MNN Bloggers and those providing comments are theirs alone, and do not reflect the opinions of MNN.com. While we have reviewed their content to make sure it complies with our Terms and Conditions, MNN is not responsible for the accuracy of any of their information.