Human flight powered solely by physical effort is deemed impossible due to the significant energy and power requirements needed to achieve lift, which far exceed human capabilities. Studies indicate that a 70 kg person would need to generate around 800 N of lift, translating to an impractical caloric output for sustained flight. While there have been attempts at human-powered flight using mechanical aids, such as bicycles, no successful examples exist of individuals flying solely using their arms and legs. The discussions highlight the biological and physical limitations of human anatomy compared to birds, which have evolved specific adaptations for flight. Ultimately, without mechanical assistance or significant alterations to human physiology, self-powered flight remains unattainable.