See, and know. I went through a medical assessment class where we were all video taped then shown all sorts of eccentricities we are never aware of. You actually need to step outside of yourself and view from various angles. It can be really surprising how weird we move without being aware of it. Experts can determine neck, back, hip and knee displacements or injuries just by observing a persons gait and how the feet are placed. Heel or toe walking, twist, swivel, stomp, double landing, bounce. The greater a persons BMI is the more toe out and twist. Pigeon toe is guarded foot placement, commonly caused by injury or debility. It's a poorly balanced gait produced by compensation(s).