Take a second and think about what's carrying the weight of your chest for those 12 hours.
For most of us — especially anyone who's a D-cup or bigger — it's a regular bra. And a regular bra makes one critical mistake: it hangs the entire weight of your chest off two thin straps that press straight down into the tops of your shoulders.
That's the whole design. The straps do the lifting. So all day, gravity pulls your chest down, those straps pull back up, and every ounce of that pressure lands in exactly one place — the tops of your shoulders and the base of your neck.
Now add a 12-hour shift on your feet. Add leaning over beds. Add the way your shoulders naturally roll forward when you're worn out.
Your shoulders aren't giving out because you're weak, or getting old, or doing something wrong. They're giving out because they've been carrying a load they were never meant to carry — for 12 hours straight — held up by two straps the width of a shoelace.
One OR nurse said it better than I could. She just wanted her chest "out of her way" at work. She wasn't being dramatic. She was describing the exact problem — a part of your body that's supposed to help you, quietly working against you every hour of your shift.