I don't know that I've ever met a jock-like ISTP personally. Most of the ones I know are far from it. Graphic designers, film directors, musicians, artists, rock-climbers, sailers, sculptors, architects, etc. You gotta stop paying attention to the stereotypes and just look at which functions you identify with. ISTPs (and all Ti-dominants) are Introverted Thinking types meaning that their default perspective is their own understanding of a concept (doesn't have to make sense to the outside world just has to make sense to them). As such then, they reject the evaluations of the outside world (extraverted Feeling) in favor of their own conceptual coherence. This is what gives them, in many cases, their somewhat cold and aloof demeanor (or hypersensitivity to criticism). Really has nothing to do with a jock or nerd or anything like that (those are typically disparaging labels applied by envious people who are neither intelligent or athletic).
So ISTP will have the preferences of
Introverted Thinking (Captain of the ship)
Extraverted Sensation (seeing the world as it is - First Mate)
Introverted Intuition (gut-feelings - troublemaking function at times)
Extraverted Feeling (externally centered evaluation -- mutinous crewmember)
INTP's function stack is
Introverted Thinking
Extraverted Intuition (gut-feeling about possibilities)
Introverted Sensation (how you see something takes precedent over what is actually there)
Extraverted Feeling (still being kicked off the boat)