this will vary as much as asking how do powerlifters train, or how do strongmen train, or even more so how do bodybuilders train.
it depends on the gym they go to.
some do higher frequency, some do higher weights, and some do higher of both (bulgarian method).
im sure many do some off season work to build some more muscle as more muscle can mean more strength. some may only do extra work on weak links.
as for cardio, their event lasts less then 10 seconds, so conditioning would only be done to increase work capacity.