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Fitness trainer Mackie Shilstone helps Serena Williams return to top form
- Updated: June 20, 2009
“He’s tough,” Williams said. “He (Mackie) definitely gives it to you. He has a heart of gold, so if I’m dying or if I’m really sore, he’s always making sure I’m OK. But he knows when to push and when not to push, which a lot of times the trainers don’t know that.”— Serena Williams, World Tennis Champion
