I no longer remember the precise path through which I came to Katy Bowman’s work, but it must have gone something like this: Parkour to Georges Hébert to Erwan Le Corre to Katy Bowman.

Once I found her Katy Says blog, I stuck around for a while—binge-reading the trove of posts I found there, watching the related videos, and listening to back episodes of her podcast. That material, together with what I found in her then-newest book Move Your DNA, went into a piece I wrote for Wise Bread that suggested natural movement as a way to get fit that was doubly frugal—no cost for the gym, plus you get to do some of your exercise while you’re working.

Unbeknownst to me, Katy was on the verge of publishing a book on just that topic and when I shared my article with her, she offered to send me a review copy of Don’t Just Sit There.

Katy’s thesis in brief is that your body responds to the forces applied to it by adapting itself: moving toward the most optimal form for dealing with those forces. The forces it experiences are wildly diverse—gravity, the continually changing pressures caused by clothing and by breathing, the stretching and compressing of all parts of your body as you move them, the activity of your intestinal biome, etc. Your body as it is now includes a lifetime of accumulated adaptations.

If you had spent your life moving as humans moved during the period in which the human form evolved, your body would have adapted itself most excellently. But you probably haven’t. You’ve probably spent your life sitting in chairs, wearing shoes, riding in cars, and doing a hundred other things that no one had ever done until just the last few hundred years—things that have produced a relatively novel set of forces, resulting in a set of adaptations that are probably not ideal.

Among those adaptations are many things that are considered diseases—osteoarthritis and osteoporosis being two of the ones most obviously related to the history of forces applied to your body. But most “lifestyle” diseases like high blood pressure, coronary artery disease, type-2 diabetes, allergies, and asthma also have their roots in adaptations to the lifetime history of forces applied your body.

It is these adaptations—and the resulting disease processes—that explain why sitting all day is an independent risk factor for all-cause mortality, even for people who exercise regularly.

And that is the starting point Katy has chosen for this book. Sitting all day is clearly bad for you, but what should one do instead? Using the model that Katy provides, it is easy to understand that simply replacing sitting all day with standing all day is not an improvement. The problem is not any particular posture; it is maintaining a static posture for hours each day. Specifically, it’s the forces produced by maintaining a static posture for hours each day.

What’s good about this insight—that many disease processes are deeply related to your body’s response to the forces applied to it—is that it is very easy to apply different forces, and thereby produce different adaptations: Adaptations that make your body stronger, more functional, and more healthy. These different forces can be produced by engaging in natural movement.

It is, of course, no easy thing to overcome the results of a lifetime’s movement history. You probably can’t even think of many of the things that all humans did daily for millennia, and without a lifetime of practice, you wouldn’t be able to do them well. If you tried, you’d surely hurt yourself—your adaptations have produced a body that can no longer do certain things.

Happily, Katy’s book provides exactly what you need: a program for safely achieving the capability of filling your day with natural movement—without hurting yourself, and without hurting your productivity. (I was going to say “and without losing your job,” but it’s more than that. Katy is endlessly productive, and clearly cares deeply about your ability to be productive as well, whether you have a job or are simply doing work you think is important.)

This provides the core of the book. There’s a chapter on how to stand (because your lifetime movement history has probably produced habits—and a body—that don’t make it automatic to stand in proper alignment). There’s a chapter on how to sit (for the same reason, plus you probably have a chair that encourages poor posture). There’s a chapter on the small movements that don’t even need to interrupt your work. There’s a chapter on the larger movements that probably do interrupt your work, but only for a minute or two.

All that is preceded by a chapter on building a workspace that doesn’t lock you into one or a few static postures, and then followed by a short group of chapters that use all the preceding information to build a specific program with exercises that build toward filling your workday with natural movement.

What I like best about the book is that it constructs a model for how to think about all these issues. Instead of finishing the book wishing that you could ask the author the right way to deal with this or that particular workplace situation, you can figure it out on your own by applying the principles presented.

If the book has a flaw, it is only that some of its recommendations are based on specific research, while others are simply Katy’s well-informed gut-instinct about what would be better—and the distinction is not always well-marked. For example, there’s an excellent reference to research on the health effects of light pollution to justify suggestions for dealing with lighting and screen time. The related suggestions for engaging in “distance eye-gazing”—that one take “a quick glance every five minutes, and more extended gazes every 30 minutes”—don’t include a reference. I suspect this is because there has not yet been any research to quantify whether those specific time periods are frequent enough and long enough to significantly improve outcomes, but the book doesn’t say.

If you do work—whether for a living, or simply because you’re trying to accomplish something—this is a great book. It’s filled with actionable tips for adapting your workspace to allow you to fill your time with natural movement, and it provides a program for doing so. Most important, it constructs a model for understanding the underlying problem, meaning that you can adapt the program to your own situation.

The paper book is the text portion of a multi-media program with audio and video as well as an ebook. I haven’t seen it, but having heard and seen audio and video created by Katy, I don’t doubt that it is also excellent.

You can buy the paper book Don’t Just Sit There by Katy Bowman from Amazon. (That’s an Amazon affiliate link.) Or you can buy either the paper book or the multimedia program directly from the publisher.

As a bonus, here’s video of Katy filling an hour of work with exercise and natural movement, run at high speed so you can watch the whole hour in just a couple of minutes.