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Do a barbell curl or benchpress at any gym.
You will first gain access to a gym after the Drive-thru mission early in the game.
Sweet will give you call and tell you to start going to the gym to build more muscle.
Gyms are represented on the map by the dumbbell icon.

Travel to the gym, which is located right near Grove Street and enter and go to either the bench press machine or the two dumbbells sitting on the ground. Press to start the exercise. Both exercises will require you to rapidly press in order to perform a single repetition. For this trophy you simply need to do one repetition of either the dumbbell curls or the bench press.

The below video shows how to unlock the trophy at the first available gym in the game: