Dylan Gee 🇬🇧🇳🇿 on Instagram: "5 core exercises for tennis players 🎾 1. Shoulder taps 2. Mountain climbers 3. Deadbug 4. Birddog 5. Sideways plank with variation #tennisfitness #tenniscore #workout #fitnessexercises #coreworkout #corestrength #tennisplayer #tenniscoach #tennistraining #tennis🎾"