I always look back to my first Olympic medal in 2004 in Athens. I was very new to the sport, and it was my first big win at the Olympics.

What's really heavy on my heart is fighting physical inactivity.

I try to think about my goals. I think about my competitors-I know they're working hard, and if they are, I have to work hard too. I have to be one step ahead of them.

Being a role model is a privilege.

I know that they [Jackie Joyner-Kersee, Florence Griffith-Joyner and even Wilma Rudolph] have paved the way and they have been a source of inspiration.

When I was younger, Jackie Joyner-Kersee was a mentor to me and gave me great advice. The best was to 'work 100 percent, but enjoy every moment along the way.' Sometimes you get so in the zone, you forget to enjoy your passions. I love running—but I also love the movies, relaxing on the beach, shopping and spending time with my friends. Enjoying my life helps me enjoy my running.

I focused solely on the sprints, dedicated my time there, got in the weight room, just really did everything I could to make sure I would be in the best position to run for gold.