Stoked to try something new this summer? Get your surf on! A favorite fitness activity of super-fit celebs like Jennifer Aniston, Kate Hudson and Cameron Diaz, surfing is not only super fun, but offers a killer cardio workout to boot. Here is what you need to know before you hit the waves. MORE WOMEN IN THE WATER Like many sports, surfing was once dominated by men. But today, the waves tell a different story. From 2001 to 2005, the proportion of women among the 2.3 million surfers worldwide jumped from 19 percent to 33 percent, according to Board-Trac, a board-sports market research company. Female-focused apparel brands have driven major revenue into the billion-dollar surfing industry, with top-seller Roxy increasing their sales from $20 million to $650 million in the past ten years. Plus, there are now magazines and websites (check out Surfer Girl and Wahine Surfing ) focused solely on the girls. BODY BENEFITS OF SURFING And it’s no wonder so many women are flocking ...