Work on low end of pedal cadence by having athlete pedal as fast as possible in the largest gear on the bike. This would be the large chainring in front and the smallest cog in the rear. This drill should last for a duration of 40 complete pedal revolutions and be done on a flat road.
Work on the high end of pedal cadence by having the athlete pedal at maximum pedal frequency. On a downhill road, have the athlete select a very low (easy) gear so there will be no resistance on the cranks, and see how many revolutions are possible in a period of six seconds. Cadence between 160 and 200 is target.