Subtalar Joint Axis Location and Rotational

Kevin A. Kirby, DPM, MS*

A new theory of foot function based on the spatial location of the subta- lar joint axis in relation to the weight bearing structures of the plantar foot is proposed. The theory relies on the concept of subtalar joint rotational equilibrium to explain how externally generated forces, such as ground reaction force, and internally generated forces, such as ligamentous and tendon tensile forces and joint compression forces, affect the mechani- cal behavior of the foot and lower extremity. The biomechanical effect of variations among individuals in the spatial location of the subtalar joint axis are explored, along with their clinical consequences, to offer an ad- ditional theory of foot function, which may improve on existing podiatric bio- mechanics theory. (J Am Podiatr Med Assoc 91(9): 465-487, 2001)

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The importance of regular movement.
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Modern Life

It begins in childhood — sitting at desks, limited play, and too much screen time.
As we grow, stillness becomes the norm. Chairs, shoes, cars, and screens replace natural movement.

By adulthood, our bodies are already adapting — in all the wrong ways. Muscles weaken, joints stiffen, and we move less without even realising it. Modern life doesn’t just reduce movement. It rewires us away from it.

Designed to Move

Our bodies were built for motion. From the ground up, everything about us is made to move — joints that bend and rotate, muscles that contract and respond, feet that adapt to uneven terrain. Movement is in our DNA.

But when we stop moving, the system breaks down. Joints stiffen. Muscles weaken. Posture collapses. And our bodies start to compensate in harmful ways — creating tension, imbalance, and pain.

Movement isn’t just natural. It’s necessary. Without it, we lose not just mobility, but function.

Reclaim Natural Movement

You don’t need a gym or hours of free time to start moving better — it begins with small choices, repeated daily. Walk during your lunch break. Take the stairs instead of the lift. Spend more time barefoot at home. Choose shoes that let your feet move naturally. These simple habits reconnect you with the way your body is meant to function.

Reclaiming natural movement isn’t about doing more — it’s about doing what’s right for your body. The more you move with intention, the more your strength, balance, and coordination return. Over time, movement becomes effortless again — not something you force, but something that flows.

MAKE THE CHANGE

Feeling stiff, unstable, or disconnected from how your body moves? If yes, this is your sign to start changing that.

Movement doesn’t have to be complicated. You just need the right tools, a bit of guidance, and a simple way to begin. That’s exactly what our Starter Bundle is designed for.

It’s everything you need to rebuild strength, stability, and mobility — starting at the feet and working your way up.

Small daily changes lead to lasting results. Your body is ready — now it’s your move.