When considered in total, the literature does seem to support the existence of a “strength zone” for increasing 1RM, consistent with the concept of a repetition continuum. The apparent dose–response relationship provides further evidence for the causality of the adaptation. Some researchers have proposed that the periodic “practice” of lifting with heavy loads is sufficient to maximize strength adaptations [16,25], but this hypothesis remains speculative. Further research is necessary to determine how frequently one needs to lift in the leftward portion of the repetition continuum to elicit maximal 1RM increases.