On work on a landed Oil and Gas rig and my job entails a lot of sitting and staring at a computer screen... for that reason I generally do pullups all night, squats, calf raises, hanging leg raises, pushups (and man varieties of floor exercises) to stay fit. And I try to eat very clean.
Other than that I love playing volleyball, soccer, and just about any other sport when I get the chance. I tried running naked down the beach once.... ONCE! I was introduced to the reason why women wear sports bras! :P
For me it's all about recognizing when I have free time and filling it with something instead of mindlessly wasting it.