EBT - Evidence Based Training - The desire to train your "inner chest" to fill the gap between your pecs usually leads to recommendations of doing certain exercises which "focus on the
Guys with a chest gap, what does your chest look like when you added muscle to it? : r/gainit
Muscle Insertions and Genetics — HOUSE OF PULL-UPS
What workout is best for closing the gap between my pecs and why? - Quora
How Can I Fill In My Sternal Gap? - Plastic Surgeon | Dr. Barry L. Eppley, MD