A man or woman dedicated to improving the physical fitness of others through the implementation of a rigorous workout schedule. Because of their well toned bodies, they are often the target of many sexual advances.
Girl 1- "Hey, do you think that new girl in spin class is really here for the workout?"
Girl 2- "No way, she totally came to throw herself at our buff fitness instructor. How sad."
Girl 2- "No way, she totally came to throw herself at our buff fitness instructor. How sad."
by GirlUpstairs April 27, 2009
That guy who is not in very good shape, yet feels the need to criticize everyone on their form and the amount of reps someone does during a specific exercise.
Guy 1: Yo dude, your curling form is horrible. Straighten your arms and increase your weight.
Guy 2: STFU Mr. Fitness Instructor. Since when did you become an expert this shit?
Guy 2: STFU Mr. Fitness Instructor. Since when did you become an expert this shit?
by BIG SCRAP November 24, 2015