RED-S is a clinical concept introduced in 2014 that broadens the understanding of the athlete's triad. It includes nine areas affected by energy deficiency relative to the body's needs for optimal functioning and it is known that both adolescents and athletes are at higher risk of suffering from a RED-S than the general population. We highlight that sports coaches in French-speaking Switzerland do not know of RED-S nor of its health consequences. They desire to learn more but mention several barriers to this training. Since they have a central role in the lives and health of adolescent athletes, they are the key persons to train in order to improve the prevention and detection of adolescent athletes in need of medical attention.