Every summer we say we're going to "take up tennis" to get a total body workout. Maybe, while we were talking, you actually picked up your racket this year and now want some tips from a pro on how to improve your game. How's two-time US Open champ and five-time Wimbledon Grand Slam winner Venus Williams for a real pro? The Olympic gold medalist will participate in a live video chat and "tennis clinic" hosted by Polo Ralph Lauren and Mercedes Benz, today at 2 pm on legendsclinic.com. According to Media Bistro, Williams will be set on a tennis court so she can demonstrate her tips instead of just talking about them. As part of the US Open promotion, Ralph Lauren is also selling a Venus Williams limited-edition polo and dress. Fifteen percent of the proceeds will benefit the Women's Sports Foundation. Do you have any burning questions you'd love to ask Venus Williams?