I love to sweat. So does Anna Kournikova.

"I feel great when I sweat and get all the negative energy out," says the tennis pro who spends much of her workout time using weights and machines so she can maintain her muscle mass. She doesn't devote much time to cardio but does do a little so she can relieve stress and sweat.

On the internet speculation about her weight loss, Kournikova says: "You know that you're a public person. You know what you're getting yourself into and you just have to be okay with yourself. It's just somebody's opinion and you just can't focus on that."