2 PCS High Elastic Wear-Resistant Tennis Trainer(With Rope & Ball)

1. Material: chemical fiber/rubber, etc.2. Fasten the bungee cord through the thread hole and tie a firm knot3. Pull out the plug, fill it with water or sand to increase the weight, easy to use4. There is a tennis groove on the front, and tennis can be placed after training5. The diameter of the tennis ball is 6.35-6.67 cm, the elastic coefficient is 2.54 meters, and the rebound height is about 1.3 meters when dropped from a hard ground6. Elastic rope length: 4 meters7. Weight: 70 grams for the ball, 80 grams for the baseSteps:1. Base irrigation/sand irrigation2. Tie the string tennis ball to the base3. Hit the ball slightly upward to prevent the ball from being pulled back to the ground by the rope