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Venus Williams is one of the greatest tennis players of all time, but she's wildly successful off the court, too.

Her secret? Staying fit, taking inspiration from her sister, and juices, juices, juices.

"It's just a part of my life," Williams tells FNM of her juice-filled diet, adding that she actually owns four Jamba Juice locations in the Washington D.C. area. "It just makes me happy to be able to share the message of the benefits of juicing with everyone."

But it takes more than just juices to fuel a champion. In our exclusive interview with the multiple Grand Slam winner, Williams says she also takes strict care of herself, and goes to the gym on her off-days to keep fit.

"Even if you're not going to be a professional athlete, you should be moving your body, doing good things for your body, [watching] what you put inside your body," she says. "It's important because it's all you've got!"

For more from Venus, including the lessons she's learned from her sister and her personal workout mantras, watch the entire interview above.