If you sit in front of keyboard all day, you should start doing an exercise called the wall slide immediately. Why? Because it helps undo the damage caused by slumping forward all day. After all, a hunched posture can leave you with the rounded shoulders look of a caveman. Worse, it can also lead to neck, shoulder, and back pain. So use the wall slide to beat back bad posture for good. In fact, for best results, do this exercise up to three times a day. (It’s easy to do in your office.) Yes, it looks simple—and it is. But you’ll love how good it makes your shoulders and upper back feel.  Watch the video above to see how to do the wall slide with perfect form.

And for full-color photos and instructions of 600 more exercises, along with tons of workouts and useful fitness advice, check out The Men's Health Big Book of Exercises today. It's the most comprehensive collection of exercises ever created.

LADIES: There's a women's version of the book, too! Click here to see The Women's Health Big Book of Exercises.