I was walking in the woods this morning while three joggers passed me.

It was interesting to observe them because each jogger's running mechanics was noticeably different from the others. 

The middle jogger was perky, upright, toes forward, shoulders back, making running look effortless.

The one on the right had her feet turned noticeably outward as she ran. 

The one on the left had completely different mechanics with her arms a-swinging awkwardly along with corresponding effort from her legs where the feet seemed to loop outward before each heel strike. 

What did this tell me?

The jogger on the right probably has flat feet and will likely develop foot pain from running. I say this because outward foot turn often indicates the anterior and posterior tibialis and peroneus muscles are not firing properly. These muscles support foot arch and ankles. There's probably also involvement from the lateral hamstrings, adductors...

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