1 definition by Nightowl358
Those people(usually women) that you see in the gym every single day whose entire workout revolves around cardio exercise. You'll pretty much never see them in the free weights section or even on the nautilus machines. Their whole workout can be summed up as either a lengthy period of time on some cardio machine(like an elliptical) or they take some group cardio class. They get all sweaty and really think they're killing it in the gym, but as time goes on, you notice that their bodies look no different because they plateaued ages ago.
That girl hits the gym almost everyday and she's thin and flabby at the same time. Must be a cardio bunny.
by Nightowl358 September 29, 2015