The term that describes the number of repetitions done without rest is the concept of "set." In resistance training and exercise, a set refers to a specific number of consecutive repetitions of an exercise performed without taking a break. For example, if you perform 10 squats in a row, you have completed one set of 10 reps.
Understanding the structure of workouts often involves the use of sets and reps. When designing a training program, athletes and trainers will outline how many sets of particular exercises will be completed, along with how many repetitions are included in each of those sets. This method allows for systematic progression toward strength and endurance goals.
In contrast, rep range typically refers to the target number of repetitions within a specific set goal, while interval relates to the rest or active recovery period between sets or exercise bouts. Constant does not specifically relate to the context of repetitions or sets in this scenario. Thus, "set" is the term that correctly captures the idea of performing multiple repetitions without a break.