Lift your arms up and away from you, focusing on the engagement of your upper mid back muscles between your shoulder blades. (thebettyrocker.com)
It's very common for woman to experience mid back pains after delivery or have difficulty taking a deep breath. (intuitivehandspt.com)
Some type of inverted row variation, either on a bar, rings, ropes or suspension straps should be included for mid back thickness and strength. (onnit.com)