We usually attach a rep range to a training set. Not a bad thing, but reps are not best indicator for determining an effective training set. Sometimes inexperienced trainers, or those individuals who are beginners, or intermediate status rely too much on repetitions rather than the state of the muscle.
You see, the objective when performing a set is to make every rep count by feeling the movement of the exercise from start to finish, for every single repetition, but most importantly at the completion of each training set, the muscle should be thoroughly exhausted.
What often happens when only counting repetitions, the muscle is under trained, because the rep range the for the training set is the priority instead of focusing on the muscle reaching exhaustion. You can now see how this training strategy overtime will produce sub par results because the muscle is not getting properly trained.
This will definitely have a negative effect on one's performance, and the way they look. Seasoned trainers know this and should continue to emphasize when training clients that it's fine to have a rep range as a form of accountability, as well a goal to hit, but the focus must remain on the muscle itself. If by the end of the set you still haven't thoroughly exhausted the muscle, it would be appropriate to do more reps until it happens.
Conversely, when you're not able to complete the repetitions you've set for yourself in a training set because of muscle exhaustion, it should not be considered under performing, which ironically is exactly what happens. It's hard to be logical and objective about the fact that muscles can't count, which is why you want a trainer who fully understands the training process.
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Best, The Truth Talker (Leo Costa Jr)