yeah man welcome to IM you should read alittle more this has been discussed so many times but to anwer your question. there is no way to isolate the chest it is one muscle. there is no upper middle and lower. others will chime in and tell you the same thing.
for chest i like decline dumbell press and dumbell bench. i have gain nice size from doing these will incline dubbell press and dips.
it all takes time
also everyone has differnt genetics so shape size is predetermined. but i could be worng about that.



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