Mick Situp is a Sim who makes his debut in The Sims 3: Late Night. He lives alone in a penthouse located in Bridgeport. He works in the Science career track at level 1 and his performance is slightly bad, though it is quickly corrected. He has no skills.
He generally gets along with his neighbors and is good friends with Brigid Steele, friends with Alexander French, Brandy Collins, Lola Belle and Big Hartley, he is also distant friends with Barry Tenderlove, Daisy Swizzle and Buster Round. It is highly-probable that he is related to the repo-woman La-Teesha Situp in some way, since they live in the same neighborhood and share a surname and physical features.
His name may be a pun on 'mix it up' or 'Mick, Sit Up'.