Training Thursday: Who needs a fancy gym when you have the parks in your backyard? @alizecornet is working hard with 2018 on her mind! Send a 💪 if you train hard on and off the court! (🎥 via @alizecornet) #USOpen #wta #tennis #training #tennistraining #tennislife #instatennis #instasports #trainingthursday #alizecornet