Energy is made in the cells in our body from the food, water and oxygen in our blood and moved around the body by the heart. Every part of our body needs energy to work properly. Our brains need energy to think, our lungs need energy to breathe, and our muscles need energy to walk, climb the stairs and run; we even need energy to eat our meals.
When you have a special heart (a single ventricle heart condition), you can’t make as much energy as your friends because you may have less oxygen in your blood and only one of the two heart pumps needed to move that oxygen around your body.
It is normal for all of us to have less energy as the day goes by. That is why we all feel tired before bedtime, most people understand that. What is harder to explain is why children with a special heart use a lot more energy doing the same day to day activities but can’t make it as fast as their friends. To make that easier to understand we use spoons to explain.