You may want to check out CT’s HSS-100 for chest specialization.
Here is an excerpt from one of CT’s posts:
"Studies by Seger et al. found that different types of muscle contraction (eccentric vs. concentric) lead to localized muscle damage in specific parts of a muscle group. Eccentric contractions creates more damage in the distal portion (near both insertions) of a muscle group while concentric contractions creates more damage in the proximal (or muscle belly) portion.
Don’t get me wrong, both types of muscle contractions creates damage on the whole muscle, but the relative amount of damage to different portions of a muscle is contraction-specific. That result is an indirect indication that it IS possible to put more training stress on different portion of a muscle group.
Furthermore, more recent physiology research has found that not all muscle fibers run all the way from one insertion to the other; many muscle fibers are actually intermediate fibers that only cover a small portion of the muscle length.
While these fibers do not represent the majority of the fibers within a muscle group, they still form a significant portion of the motor unit pool. If certain muscle fibers cover only a portion of a muscle, it also indicates that it is possible to place more growth stimulation on certain parts of a muscle.
Finally the fact that different parts of a muscle group can get sore depending on the exercises being performed is also an indirect indication that putting more growth stimulation on certain parts of a muscle group is possible."