Please select the channel that most closely reflects your concern about the video, so that we can review it and determine whether it violates our Community Guidelines or isn't appropriate for all viewers. Abusing this feature is also a violation of the Community Guidelines, so don't do it.
You’ve probably heard tennis players making unique noises while playing tennis. Does it help? Jason Lindsey aka “Mr. Science” with Hooked on Science explains why making a racket when you use your racquet could make you a stronger tennis player. Go to http://www.hookedonscience.org/nextgenerationsciencestandards.html for the FREE NGSS experiment guide.