Low rep ranges cause muscle growth as type 2 fibers, with greater potential force to be generated and lower endurance. Higher rep ranges, type 1 fibers, lower force, greater endurance. Makes sense and I don't concern myself much about it but I see programming that's in the 5ish rep range on a strength program, then with additional exercises has 15-20 rep sets to work on weak areas.
Wouldn't the lower rep range exercises and higher rep range exercises sort of contradict each other? Is this really optimal for strength training? I know I am wrong and that sort of programming is fine, but I don't understand how.