What helped me with this is I saw a show on TV that explained how we walk and that older people often fall because they are looking down, watching the ground instead of looking out, forward so are not balanced right and can't correct fast enough if there's a "problem". It's an ergonomic sort of thing (why one's neck can ache from looking up/down at a computer screen instead of straight out, etc.).

Thinking about alignment and how one is standing/walking is a great focus and mindful activity.