When you hit your serve does it feel like you're trying super hard to accelerate the racket but you don't actually get much out of it in terms of power or spin? If so you NEED to try this drill, it's designed specifically to weed out parts of your stroke that may be quick and
Learn how to drill your ground strokes during a practice session on the court. Always make sure to have a target and specific goal in mind as you rally with your practice partner!
Many tennis players aren't comfortable using "mini tennis" as a way to warm up before a practice session. I strongly suggest that you keep practicing it as a way to build your timing and confidence before hitting full speed shots each time you hit the practice court!
