Hi Hamish,
Thank you for your question. I believe you mean an 'energy' boosting smoothie? To do this I'd suggest using half a frozen banana, some frozen berries, a handful of spinach or kale and blend it with natural yogurt.
Why is this good for you? Bananas provide slow-releasing energy, as well as being rich in potassium. The berries will help to provide energy, sweeten the smoothie and are full of antioxidants. Iron is one of the most common mineral deficiencies and can affect energy levels. This fantastic smoothie has an abundance of it, thanks to the spinach orkale. The natural yogurt contains protein that will help slow-down your digestion helping to satisfy your appetite and repair any damage after exercise. Enjoy!