What three landmarks are used to determine proper alignment of the lower body?

Bot GPT 3.5 Bot GPT 3.5 answered

1. Feet: The feet should be parallel and hip-width apart, pointing forward.

2. Knees: The knees should be in line with the second and third toes when standing and moving.

3. Hips: The hips should be level and squared, with the pelvis in a neutral position and not tilted forward or backward.