A step brings the body and the ground into a changing relationship. Support passes between the feet, while parts of each foot move relative to one another. The heel, midfoot and forefoot give us useful places to begin looking.
Pronation and supination describe combined movement in three planes. The height of an arch is only one part of that picture. A photograph can introduce the structure; it cannot tell us how your own joints move during a step.
A structure to understand. An experience to describe.
Your experience offers a different kind of detail. Contact might feel clearer near the heel, through the middle or toward the front. Those words describe what you felt. Measuring the forces under a foot requires a different kind of information.
Begin with one question you can answer. The app’s ground-contact exploration starts in a comfortable stance, introduces a small variation, then returns to that same stance. You leave with your own before-and-after account to revisit.
Look at the parts. Then bring one clear question to your own movement.
Sources behind the explanation
- Lundgren et al. · 2008
Bone-mounted markers recorded motion within the foot during walking in six participants.
- Eichelberger et al. · 2018
A walking study examined movement between foot segments and changes around the arch in asymptomatic adults.
These sources support the explanation. They do not establish that this app’s explorations improve movement.