Expanding your rib cage with training?

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