Use the "Twist Rotation Drill" for more serve power

Get "Crush It!" here: https://bit.ly/3M8bQVL Got a super-cool tennis serve power drill to share with you called "The Twist Rotation Drill," which lets you generate more power from your back hip. A lot of players just bend their knees when they serve, but they don't twist back and down, which causes them to leave 5 - 10 mph on the table, easy.