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How to build pectoral muscles
Do bench presses.
To do bench presses, you will need a barbell and a bench. Lie back and grasp the bar with your hands shoulder-distance apart.
Lower the bar all the way down to your chest and then slowly press it straight up until your arms are fully extended. Start with 3 sets of 10 reps and increase the number of reps and the weight as you gain strength.