The image shows a bubble diagram to represent the symptoms of relative energy deficiency in sport (RED-S). The term RED-S is the middle bubble and there are 9 bubbles coming off this central bubble. These 9 bubbles contain the words decreased aerobic endurance, decreased muscle strength, decreased energy stores (glycogen), poorer adaptations to training, decreased coordination, increased depression, increased irritability, worsened concentration, poorer decision making and decreased aerobic endurance.