In our next set of skill drills we are focusing on developing toughness. In this episode the CLC team focuses on drills that require players hit a certain number of shots. We address how, when and why to use the "30 ball drill" and the benefits it has for players. Dr. Larry and Coach Johnny on Twitter: @LarryLauer / @johnnyparkes1 Instagram: @johnny_parkes USTA PD Website: http://www.playerdevelopment.usta.com/podcasts/?