Editor’s note: Dana Santas, known as the “Mobility Maker,” is a certified strength and conditioning specialist and mind-body coach in professional sports, and is the author of the book “Practical ...

If you’re hunched over a computer all day, you need to counteract that sedentary, posture-crushing time with some movement. And there’s one specific spot you should be targeting: your thoracic spine.

A big contributor to back tightness is all the time we spend sitting down and the slumped-forward posture we adopt while seated, which involves rounding the mid-back and jutting the head forward, ...