Each of us has slightly different insertion points for our muscles on the left and right sides of our body's, especially when it comes to the limbs. We also can have a disaparity in the types/numbers of muscle cells and/or differences in nerve force. All of this will affect your look from the left to the right side of the body. Very few people look perfectly even on both sides.
That said, while you can not completely isolate a single head of the tricep you can more strongly work the inner/long head by doing tricep movements that involve you having your elbows up by your ears (overhead exercises). Most other exercises will somewhat equally involve the entire triceps.



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