Metabolism Basics How We Get Energy Every task our body performs requires energy. We get energy from food we eat and food stored in our body. This energy is in stored form and needs to be released to be used. Why We Need Oxygen The oxygen we breathe releases the energy in food and in our body. More body tasks need more oxygen to create more energy. The amount of oxygen you breathe reflects how many calories you burn. The Testing Process Relax and breathe into our device for 10 minutes. The device measures how much oxygen you breathe in and out. Your unique data will tell you how many calories you burn each day. Frequent Questions Book Now