The fewer reps it takes to reach the point of fatigue, the more effective your strength training is. But once you reach that point, stop, even if the instructor is still going.
But if you are unsure of the appropriate weight for a new exercise, it is safer to choose a lighter weight, and increase it next time around, than to guess at one that is too heavy.
Because of the need for a number of considerable number of retakes to produce a video, most instructors use lighter weights than is effective training. Don't feel compelled to match them rep for rep.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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