Serena Williams' ex-fitness coach explains how tennis great taught him to have fun

Serena Williams taught him "how to have fun" and introduced him to the world 

Williams, Sillstone wasn't someone who spent a lot of time on the phone 

Williams reacted when she realized Shilstone didn't even know what her Instagram 

"She (Serena Williams) showed me how to have fun and made me laugh

"I have two sons, one is 34 and the other is 30.

Serena was the first to teach me how to write emails!

She said, "I'm not on the phone.