Tennis ace Serena Williams recently surprised fans by appearing alongside Beyoncé during 'Sorry', from the superstar's new visual album 'Lemonade', and she has opened up about the experience. 

In a video posted to YouTube, Williams explained that her only instruction was to dance freely:

"She (Beyoncé) told me that she just wants me to dance, like just be really free and just dance like nobody's looking and go all out. That wasn't easy in the beginning, but then it got easier."

Williams went onto add that her passion for dancing helped her to really get into it: "It was fun. It was a great experience, I love to dance - little known fact - but, I actually really love dancing. It just makes me really, really relaxed and it's also a good way to work out without, like, being on the treadmill."

Florida-based juice company Natalie’s Juices recently reported a boost in sales of natural lemonade and lemonade tea since Beyoncé's visual album was released.

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Watch Williams dancing here: