Gather all the ingredients
First of all, put the watermelon chunks, banana, yogurt and sugar all in one place. You do not want to be running to find sugar when the ingredients are placed in a blender. Cutting the banana into small pieces on a cutting board is important.
Place watermelon and bananas in blender
Add the watermelon chunks and banana pieces into the blender. Make sure the blender is switched off when you are adding the ingredients.
Add yogurt and blend until the liquid is smooth
Add half cup of Greek-styled yogurt in the end and close the lid of the blender. Blend the ingredients at high speed for a good five minutes so that they are well combined. The liquid should be smooth and foamy. A good way to check is to insert a spoon in the blender when you have stopped. Stir the liquid and if it is smooth and nice, your drink is done.
Pour the drink in the four glasses and serve immediately as the Greek Yogurt Watermelon Smoothie tastes best when it is fresh. Add ice according to your need if you want a chilled drink.