Use less liquid
Add more frozen fruit
Add ice cubes
Add yogurt
Add banana
Add avocado
Add oats
Add chia seeds
Add flaxseeds
Add nut butter
Add protein powder
Add cottage cheese
Add silken tofu
Use frozen yogurt or sorbet
Blend in small amounts of liquid at a time
Let the smoothie sit for a few minutes
Use a high-speed blender sparingly
Avoid overblending
Chill ingredients before blending