Ignoring the effects of steroids, I will address how to isolate muscles. There are two kinds of exercises: compounds and isolation exercises. Something like a bench press, barbell squat, deadlift is a compound exercise. You work multiple muscles at once. For the bench press, you work your chest, shoulders, and triceps. However, something like a bicep curl, tricep extension, or shoulder press are isolation exercises,. They only target one muscle.
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