I get mayo girls that do it to me and it's to try and show off their "curves" but all they get is noises and disgusted looks from me and others. Male dumpsters I haven't really seen any doing cardio but they "lift" weights and try to give me shit for doing cardio.  My response is "well I don't look disgusting" I've been going around the same times now that I mostly get decent looking guys and girls running near me or elderly that'll ask me to watch out for them in case they fall.