Most of us spend the lion’s share of our days sitting in chairs, with our joints in flexion. Our hips are flexed to 90 degrees, as are our knees. Our shoulders hunch forward—unless we constantly remind ourselves not to hunch. By the time I shut down my computer in the evening, my body craves at least a few minutes of the opposite.

One of my favorite poses for countering the effects of sitting, as well as preparing my body...

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