If your fluency is 'typing', you race the clock to complete as many typed words as you can in one minute. You aim for speed and accuracy. In arithmetic, you race to complete arithmetic problems. In reading, you race to decode as many words as you can in the minute. Practice in this way helps learners achieve fluency in the technical sense summarized by Binder as follows:

Behavioral fluency is that combination of accuracy plus speed of responding that enables competent individuals to function efficiently and effectively in their natural environments. Evolving from the methodology of free operant conditioning, the practice of precision teaching set the stage for discoveries about relations between behavior frequency and specific outcomes, notably retention and maintenance of performance, endurance or resistance to distraction, and application or transfer of training. The use of frequency aims in instructional programming by Haughton and his associates led to formulation of empirically determined performance frequency ranges that define fluency. Use of fluency-based instructional methods has led to unprecedented gains in educational cost-effectiveness, and has the potential for significantly improving education and training in general.