CARIUS TRAINING GUIDE
Strength training often emphasizes relatively low-to-moderate repetition ranges with sufficiently heavy loads because the goal includes becoming skilled and capable at producing force under heavy resistance. That does not mean every strength set must contain one to five reps: productive programs can use multiple rep ranges.
Heavy, specific work develops the target lift while moderate-rep work can accumulate useful training without making every set maximally demanding. The appropriate range depends on the exercise, phase, lifter and goal.
A program should prescribe reps together with load and effort, not just treat the rep target in isolation.