In a blender, pour 1/4 cup water followed by half your banana and your strawberries. Blend until smooth then pour into your glass.
In the same blender, pour the remaining 1/4 cup water followed by your second half of banana and your spinach. Blend until smooth then pour over your strawberry-banana smoothie and enjoy!
If your blender struggles to blend everything with 1/4 cup water, add more water until it blends well.