Let’s Hear It for the Ball

Today’s news reports that chair-sitters’ backs are happier when the angle at the hips is more open: 135 degrees, rather than 90. Here’s part of why I like sitting on a stability ball (when, of course, I don’t fall off) instead of a desk chair: you can easily fiddle with the angle of the hips and placement of the legs, and it encourages frequent shifting and squirming, while keeping you from rounding the low back (unless you choose to hold a crunch while you sit).