Any bodybuilder will tell you that more than 10-12 reps is useless. A few will lift heavier weights, then fall back to lighter weights and extends repetitions

Any bodybuilder will tell you that more than 10-12 reps is useless. A few will lift heavier weights, then fall back to lighter weights and extends repetitions out past that, but it is not as common. There has been an ongoing dispute about whether going to muscle failure is a good thing, and this seems to resolve it.