The issues facing working women and their families are closest to my heart. I decided to focus intently on the challenges military wives face because they juggle the same pressures as their nonmilitary peers, all while coping as single parents while their loved ones are overseas. I wanted to help make their voices heard.

To be able to do it in the warmth and - of the White House and to do it around people who do care about my kids in a country that has been respectful of my children and their privacy, it has been less stressful than I would have imagined for me.

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.

My happiness is measured against my kids' happiness - when they're in a good place, I feel really good.

Being healthy isn't about inches, pounds, or how kids look - it's about how they feel and making sure they feel good about themselves. So rather than focusing on appearance, it's important to emphasize to kids that when we eat healthy food and stay active, we feel better, and we can perform better in everything we do, from athletics to academics.

I don't have the stressful job. Barack Obama does.

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.