The actor plays a militia leader in Falling Skies, which is executive-produced by Steven Spielberg.
Asked about making combat scenes look realistic, Wyle told Metro: "Fight scenes are like sex scenes. The better choreographed they are, the better they look.
"The more haphazard they are, the sloppier they tend to look. And you hope neither will result in a serious injury or permanent damage."
On whether he trained for the physical aspects of the show, he added: "I should have done. Every time I start a job, I go into it with great intentions, which go completely out of the window as soon as I start filming because I don't have time.
"But I actually finished the show in better shape than I started from all the running, jumping, diving and carrying a really heavy machine gun. It doesn't have real bullets in it but it is very heavy."
Season two of Falling Skies continues on TNT in the US and premieres tonight on FX in the UK.