Ask someone in the weight room to point to their trapezius muscle, or “traps” in gym-speak, and they’ll probably gesture toward the small mounds of muscle nestled in between their neck and shoulders.

For better posture, improved back health, and sturdier shoulders, start with the ABC’s…er, the I-Y-T’s. A common rehab move, the I-Y-T exercise is a beginner-friendly way to enhance your posture, nail ...