We've seen that Serena can still play great tennis. But, she remains 20 pounds overweight. You see it in her face, her legs, backside, her chest, etc. It's probably the main reason we'll never see her play consistently at her potential. Her knees and joints won't allow her to take that pounding regulary and move to the best of her abilities. One match, she looks brilliant, the next not so good. Her movement is so inconsistent and she does not sustain high level play. She's strong as an ox and obviously serves as well as ever. But, her mobility is compromised due to the heavy legs and such. She needs to do more cardio, cut her calories and sleek down. She must weigh around 185 pounds. While much of it is muscle, her body fat percentage is way too high. And, at age 27, she's going to keep breaking down physically, as she already has. She's not Venus, who will play at a top level into her early to mid 30's. Serena will be done in the next year or two, unless she drops the weight. She's too big, too bulky and overweight. She'll still be formidable on any given tournament or match, but the injuries will continue to mount. Also, her body also suggests she's taking some kind of supplements that are overly bulking her. I don't know if any of them are illegal but they are making her look like a male bodybuilder.