5 Science-Backed Reasons Your Chest Won’t Grow

Aside from stubborn calves, there’s one muscle group that seems to be hard to build for even the most dedicated lifters: the chest. You bench. You press. You even throw in cable flyes for good measure. And yet—nothing. No mass, no pop, no pec shelf to speak of.

While you could blame your parents (yes, genetics play a small role), there’s a good chance your chest is lagging for far less mysterious reasons. Recently, Mike Israetel, Ph.D., exercise scientist and co-founder of Renaissance Periodization...