We all heard the myth that you can expand your rib cage with weight training, particularly with certain exercises like the pull over and chest flyes. I asked Frederic Delavier, the author of Strength Training and Anatomy. He said it is possible if you train while young, while you are still developing.
I found an article that said something similar, if you do these exercises while young you can indeed expand your rib cage. What do you think?https://www.t-nation.com/training/ribcage-expansion-fact-or-fiction