Doing this simple exercise opened up my mid-back and made it easier to sit taller ...

But guess what? We've got some good news! There's a movement that's the perfect antidote: the so-called "back extensions." Don't picture a reverse push-up (that would be more like a bridge), but ...

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 ...