to train opposite muscle groups
my chest was really really strong, but it was much stronger than my back, that it pulled my shoulders and collar bone forward which is not a good thing
so in the past couple weeks, i lightly lifted for my chest, and i really started lifting for my back , and now i find that i am a lot stronger and my chest is better
so my advice, try to keep your body in proportion dont try to get just big arms and chest you need to train your other body parts too, including stabilizer muscle
yours in training
blue