Martial Arts Speed Training: How many reps?

For speed training, quality is more important than quantity, says author and veteran martial artist Sang H. Kim. In Martial Arts After 40, he advises, "For speed training, keep the number of repetitions low - less than 10 per set - but the quality of each repetition high. Perform each rep with complete concentration and commitment, resting between reps. If you start to feel your focus or accuracy slipping, move on to the next set using a different technique."