It's mostly genetics. Some people are just grow muscles in certain area's faster than others. However,
if you don't want your chest to grow it's not what exercises you perform, it's how you perform them. Higher amount of reps with smaller amount of weight would do the trick. Try about 25% to 50% of your "1 rep max" per exercise in sets of 12 to 15 reps. Moving quickly between sets keeping your heart rate up. This will make your routine more aerobically challenging the end result been more fat burnning and little muscle growth.
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