Self-tutoring about strength training: the tutor mentions the importance of changing rep range.
Rep ranges might be 1-6 (for strength), 8-12 (for growth), and 13 to 20 (for endurance). Yet, the key to best results might be to shift among all three ranges.
Apparently, when a muscle improves in one way, it becomes better prepared to improve in another way, and so on. Therefore, rotating the rep range seems key, rather than finding “the best one.”
Source:Oracle Tutoring by Jack and Diane, Campbell River, BC.