I had a conversation with one of my clients about his squatting and correct form last week. I have seen a lot of variations but many of them are bringing people closer to injury. I find that many people will sacrifice their form in order to "get lower" or do what the other people at the gym are doing.
I was talking to my mother the other day and she was telling me all about how she walks on her lunch hour at work and then again at night with my father before dinner. She mentioned that when she walks at work, she goes up the stairs, down the hallway and then up to the next floor until 30 minutes have passed.