Getting your ratios right
Start your smoothie with two mugs full of a liquid base. This can be milk, or a dairy-free alternative such as soya or almond milk, natural or flavoured yogurt, fruit juice, or for a tropical flavoured smoothie, low-fat coconut milk or coconut water. It's important to add the liquid to your blender before adding the fruit as this will prevent the blade from getting damaged.
Next add about three quarters of a mug of your chosen fruit. Banana is a great base flavour for any smoothie, and will give you a lovely creamy texture. Other fruits that work well are berries, mango, peaches, plums, nectarines, grated apple or pear, and melon. You may have to add more fruit or liquid, depending on the type of fruit you choose. Play around until you have a texture you like. Add a squeeze of honey, maple syrup or agave syrup if your smoothie needs it and finally add a few ice cubes to the blender for a thick and frosty smoothie.