Getting lean is probably the most important step. But you can train your inner chest so it’s ready to be unveiled after you get your body in the right place.Admittedly, you cannot singularly isolate the inner pec. No matter what chest exercise you perform, you will be engaging the entire chest. In geek speak, every sarcoma of muscle fibril will contract with each rep. But you can put added emphasise on your inner chest with the right exercises.