The serratus anterior muscle:
References:
How to Chisel the Sexiest Muscle on the Male Physique
A shredded serratus—the muscle group that runs from your pec to your shoulder blade—screams fit. Here are the 6 best exercises to define it
www.menshealth.com
How To “Sculpt” Your Serratus Anterior (The Most Forgotten Core Muscle)
The serratus anterior is one of the body's most overlooked muscles. Discover the three crucial exercises to do to strengthen the serratus anterior muscles.
builtwithscience.com
It's usually the hardest to achieve and oftentimes the forgotten part of the upper body because of the abs hyper fixation.
I like his thin but ripped body frame compared to overly big buffy bodies. That must have taken a lot of work to cultivate so I'm just super impressed. I would not want to box with him ever tho lol.
