Motor performance (the execution of visible body movements) is an integral component of many courtship displays and has the potential to be an important signal of male quality to females during mate choice. The whole organism is used in the execution of movements and involves factors such as respiration, muscle use, and current energetic reserves, and therefore motor performance may be an even more valuable signal than static traits commonly studied in sexual selection literature such as coloration or ornament size. In lekking species where a female chooses a mate from among displaying males, motor performance provides an especially interesting opportunity for studying mate choice. Which male a female decides to mate with is dependent on which males she observes. Therefore, it is important to not only look at variation in male motor performance and mating success across the entire lek, but also at the phenotypic variation between the males each female is actively choosing between. My dissertation research investigates the causes of variation in the performance of complex, acrobatic displays in the lance-tailed manakin (Aves: Pipridae, Chiroxiphia lanceolata), and the resulting fitness consequences of that variation. In particular, this project will address three key questions: 1) What factors influence variation in display performance, 2) How does male display performance influence female mate choice, and 3) How do males choose which female to direct their displays toward when there are multiple females present during a single courtship event?