Serena Williams Adds Fitness and Keeps Winning – NYTimes.com

“Every time I work with Mackie, I have really good results,” Williams said. “We work well together. He’s a great guy. He’s smart. He’s tough, but yet I still have a way of kind of making him not be so hard on me.”

Read the whole story: Serena Williams Adds Fitness and Keeps Winning – NYTimes.com.