well, i may b rong with this, but when u do certain compound movements ie BB Rows, u are working ur biceps as a secondary body part. U dont have to work biceps directly in order to werk them out. As for the stretch marks, i dont know what to tell you, personally i dont have a problem with stretch marks, so i cant help u there, but just be careful in the gym, make sure not to do strenuous excersizes that u think can injure ur Bicep. neone here...correct me if im rong. I dont wanna b givin misinformation.


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