Well, I think Serena's problem came in her off season training after her 2013 season wrapped up. I don't think she did nearly quite what she did at the end of her 2012 season in off season. I think at that point her mind was done with tennis given how focused she was in 2013 which is understandable. However, when you reach her age, you have to unfortunately keep up with fitness and training on a consistent basis if you want to continue on a high level. She could get away with not training as frequently when she was younger, but she can't really do that now.