Specificity refers to improving at a given exercise by performing it frequently. This concept comes into play in order to formulate good endurance training schedules.
Endurance athletes perform better when their training mimics their races. For instance, a triathlete ought to train in swimming, cycling, and running—not general cardio—since the body adapts in manners that are specific to the type and intensity of training. Training at the same pace as during a race, on the same ground, or in similar conditions may yield more than general training. Specificity ensures that improvements positively impact race day performance.