Sit or stand tall. Pull the shoulder blades down and back, like you're tucking them into your back pockets. 5-sec hold, 10 reps. Counters the all-day forward-slouched posture of phones + laptops.
Secondary muscles
shoulders
Form cues
1DOWN and back, not just back (don't shrug)
2Chest opens naturally as you retract
3Should feel between the shoulder blades, not in the neck
Common mistakes
⚠Shrugging up instead of retracting
⚠Forcing the chest forward — let it open passively