Figured out it was keeping a certain form/posture. Gotta get my shoulders back, drop my hips, and keep the back straight.

I can't do that "shape" as slow speed. Was strange, my foot went numb during my warm up. As I loosened up, got going, and hit my stride, it got better.

Made me very happy to run without hurting myself. Sore, though. Takes a lot of effort.