People think that there is so much money in tennis, but the reality is unless you're ranked in about the top 50 you don't earn much at all. It is hard to support yourself travelling the world, to be away from home most of the year and to pay for a coach to help you become a better player.

I started mountain-bike riding two years ago, which is much better than riding a stationary bike in the gym. Mountain biking is a total body workout.

I love anything that involves the ocean. Swimming, snorkelling or surfing are all fun, which distracts from your mind that you are actually doing a workout. Being outdoors in the sun and the salt water is great for freeing your mind and feeling alive.

Tennis Australia really led the charge as far as upping the prize money and trying to do the right thing by the players. They also led the way so women have equal prize money in all the grand slams too.

Control the things you can control .

Core strength and stability is very important to me. Tennis is all about rotation of the body and my ability to create power. I incorporate a lot of abdominal, back and glute exercises into my gym sessions.

I think Serena Williams is the best tennis player of this generation, if not the best ever. It is amazing for her to be playing as well as she is at the age of 31.