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Explanation: As someone who works out 5 times a week, is in a local swim team, and used to practice Kung-Fu, I can assure you it's common (in Argentina) to call the exercise itself by the muscle you are working out. If you are not 100% comfortable with just tríceps try "tríceps con mancuernas."
paula13 Argentina Local time: 00:37 Native speaker of: English, Spanish