Serena showed just how relaxed she felt ahead of her opening match next week as she promoted a new Nike fitness app Down Under. No wonder, with the Wimbledon, US Open and Olympic singles and doubles golds all under her belt from the last six months or so.
[Hit this link to see more pictures and read about Serena's new workout app]

I go back and forth about Serena Williams all the time. Today, I’m going forth. Looking good girl.