Sports enthusiasts are well-suited to be early adopters of augmented reality (AR) technology because they are already comfortable wearing specialized equipment like goggles during activities and are willing to pay for devices that improve their performance, unlike the general public that finds head-mounted AR displays too bulky and expensive. AR applications for activities like running and swimming that integrate virtual competitions, metrics, and games could appeal to sports enthusiasts and help demonstrate the technology's potential to a wider audience. As outdoor GPS accuracy and AR technology improves, sports may prove to be the "killer application" that popularizes the use of AR headsets.