During base fitness and endurance training you may not have been working on specific sports skills and drills, but this is critical to high-level sports performance. After your base mileage is complete, your body is perfectly prepared to fine-tune sports skills and mental focus.
Sports skills training requires isolating specific movements and practicing them over and over until they become second-nature and then adding them together in one coordinated, flowing movement. Examples include practicing cornering or riding in a pack for cyclists, balance training or plyometric drills for runners, shooting free throws for basketball players, or practicing transitions for triathletes. The number of sport-specific drills is endless, but if you use these drills to target your weaknesses you may improve your performance substantially.