(CAVEAT: I have not been a massage therapist for very long. This is literally just me spitballin’—at the same time, this was a really good exercise for me! I like using the assessment part of my brain.)
It’s been tossed around in fandom that Bucky’s muscles have to be pretty f-ed up from having a cybernetic, metal arm grafted onto one side of his body. From the perspective of a massage therapist, that’s 100% accurate—but the issues don’t stop there. At the very least he’s got functional scoliosis and massive compensatory muscle strain, enough adhesions to make Jesus weep, and tons of somato-emotional holding points.