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Motivated determined sporty muscular build man practicing dumbbell biceps curl workout, building strength in upper arm muscles and boosting athletic performance during indoors sports training .
Gym workout. Bicep exercise. Middle aged Caucasian man trains his bicep muscles in the gym. Gym training focused on biceps as man lifts weights, building muscle mass and definition steadily.
Dumbbell, fitness and intensity with man in gym for strength training or workout routine. Breathing, exercise and weightlifting with bodybuilder in health club for physical challenge or resilience
Animated human anatomy of an arm flexing, showing muscle contraction and nervous system energy

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