Serena's always been one of the best, and she will forever be one of the best tennis players in women's tennis.

I think my biggest thing is learning when to hit which serve when, not doing the exact same thing over and over. Because O.K., great, it's 120 miles per hour, but they're standing right there, and they just block it back.

It's one of those things where eventually in your career, it kind of switches from being the young up-and-comer to someone who has had results and the other person is trying to raise their level to play. I think it's a privilege.

Setting a goal, accomplishing it, and feeling good about yourself can help build confidence and perseverance.

I won the quadruple at 18 with Arsenal, so I didn't really know what I was chasing after the World Cup, and I was a bit lost, so I didn't know whether to just be content at home and just play my football or go for another challenge.

To an extreme athlete, there's a certain appeal to doing extreme things - seeking the most extreme physical challenges in some of the most extreme climates in the world. Testing and expanding the limits of human endurance is kind of my thing.

If people really want to clean the sport of cycling up, all you have to do is put your money where your mouth is.

I'm still an athlete at heart, so I always want that comfort and something that feels like an athletic shoe.