Aryna Sabalenka gives tips to young tennis players on how to speed up their serve.

Tennis pro Aryna Sabalenka shares her advice on how to have more control of a serve. Still haven’t subscribed to Self on YouTube? ►► http://bit.ly/selfyoutubesub ABOUT SELF Daily health, fitness, beauty, style advice, and videos for people who want to achieve their personal best in life.