Pour the sports drink into the blender, filling it about halfway.
Add the ice cubes to the blender over the liquid.
Secure the lid and blend on high until the mixture is smooth and well combined, with a slushy, icy texture visible around the blades.
Pause briefly to check the consistency—if it's too runny, add more ice and blend again until thick and crunchy.
Once the desired slushy texture is achieved, turn off the blender and pour the beverage into chilled glasses.
Serve immediately with a straw or spoon for a refreshing, icy treat.