Serena Williams can act as feminine as she wants, she will never get a break from those who think she is not all woman. Many have argued in the past that Serena is too muscular to be a woman, having compared the 33-year-old to the likes of Maria Sharapova and Steffi Graf — who are considerably skinnier than the tennis champ. Williams has admitted that her daily gym routine includes weight lifting and hour-long cardio sessions. The heavier her workout becomes, the more she eats on that particular day, resulting in muscle growth. Do people not know this basic information about muscle growth?