Quote (BodyBuild @ Mar 8 2015 06:02pm)
over time they can.. if it is due to a weak back.. or you could be very tight and stretching / foam rolling could help loosen you up.
a lot of people will have rounded shoulders and just rear delt / upper back directed work can help a lot with that
Agreed, traps as well.
I have a sitting job and normally I would not sit perfectly, nor do I focus on it. Did many physical labour in my teenage years, never caring about lifting right etc. I focus on it and I work standing now (desks can go up).