The foremost important thing in shaping up your body is the diet you take. It is not only the diet you take in but how you take it. Ryan needed to build muscle mass for his body and was not willing to lose weight, therefore, he ate a lot of eggs, used plenty of protein bars, protein shakes. He also increased the use of chicken steaks as he wanted to get rid of the fat and increase his muscle strength. It may sound boring to some but the fact is when you are in love with your body and are willing to do anything to make it look superb, you need to do this.
He took no help of steroids but increased the use of supplements along with his eating schedule.
He increased the duration of his workout to three hours a day. These hours were a mixture of weight training, fight training and other things he needed to learn to perform various stunts.
If you are in good shape then you can skip the cardio, but if the case is otherwise you should blend in the cardio exercises to make your body leaner.