I think the most moving part of my trip [to Africa] so far was seeing 92-year-old Nelson Mandela, and just thinking about his life. This man has lived through a struggle that few nations have known.

We are living in a time where we just don't have enough time. People are rushed. They're over worked, over scheduled. Not enough resources. ...But the thing that I want people to understand in this campaign is that families can make small manageable changes in their lives that can have pretty significant impacts.

Always stay true to yourself and never let what somebody says distract you from your goals.

When I get up and work out, I'm working out just as much for my girls as I am for me, because I want them to see a mother who loves them dearly, who invests in them, but who also invests in herself. It's just as much about letting them know as young women that it is okay to put yourself a little higher on your priority list.

My sense is that being a First Lady is a full-time job, but I'll know more when the time comes.

It's not about government telling people what to do. It's about each of us, in our own families, in our own communities, standing up and demanding more for our kids. And it's about companies like Walmart answering that call.

You can be a good mom and still work out, get your rest, have a career - or not. My mother encouraged me to find that balance.