"I definitely struggle with depression for a long time and I, you know, was vocal about it not until 2012," she says. "It's like the loneliness really gets to you. If you're training that hard for something, I mean, your team is there and I'm sure your family are there, but at certain points, you're just alone in the thoughts." She adds: "Success isn't equal happiness. You have to find that on your own"