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."
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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?