Generally they do high repetition exercises or explosive power movements for low reps. They also do sledgehammer swings, kettle bells, tyre flips, sled pushing/pulling,etc. The ones that are massive and ripped used to do powerlifting/bodybuilding routines but not any more because conditioning is more important than strength and size.
that being said they'll definitely be doing the major exercises like chin ups, dips, bench press, press up, overhead press, deadlift and squat but the rep ranges/loads used won't be super heavy