Answer:
Blood doping
Step-by-step explanation:
This is called blood doping and many athletes have used it (its cheating btw). They'll go to a place with high elevation and train and then take their blood. After they go back to a lower elevation they inject that blood back in and it allows them to be able to perform better. So in this case, the cyclist would be able to perform better over her competitors (more energy/able to exert more energy for longer period of time, etc.)