One thing that I've learned from male role models is that they don't hesitate to invest in themselves, with the view that, if I'm healthy and happy, I'm going to be a better support to my spouse and children. And I've found that to be the case: Once my kids were settled, the next thing I did was take care of my own health and sanity. And made sure that I was exercising and felt good about myself. I'd bring that energy to everything else that I did, the career, relationship, on and on and on.

You may not always have a comfortable life and you will not always be able to solve all of the world's problems at once but don't ever underestimate the importance you can have because history has shown us that courage can be contagious and hope can take on a life of its own.

During the first campaign, one of my jobs as my husband's spouse was to travel around the country and really listen to women. There were voices that were new to me: the voices of military spouses, many of them women, and veterans.... I was overwhelmed by their challenges, and the notion that we as a country don't even know that these women exist, because we live in a country where one percent of the population protects the rights and freedoms of the other 99 percent of us. I thought that if I had the opportunity to serve as First Lady, I was going to use this platform to be their voice.

It's hard to change adults, and it's hard to change it from a political position or a perceived political position.

Exercise is really important to me - it's therapeutic. So if I'm ever feeling tense or stressed or like I'm about to have a meltdown, I'll put on my iPod and head to the gym or out on a bike ride along Lake Michigan with the girls.

My mother's love has always been a sustaining force for our family, and one of my greatest joys is seeing her integrity, her compassion, her intelligence reflected in my daughters.

We have had with Barack Obama some just amazing experiences traveling abroad, being able to introduce our children to the world.... I'm also humbled by the response and the receptiveness, not just here in America, but around the world. There's a part of that warmth and enthusiasm and hope that is surprising and humbling.