ISSA Trainer Practice Exam 2025 – Complete Study Resource

The statement regarding training at 55% to 65% of one-repetition maximum (1RM) being most effective for muscular endurance is accurate because this range is typically identified as the optimal intensity for improving muscular endurance. Training at this level allows for higher repetitions, which is essential for enhancing the muscles' ability to sustain performance over time.

Muscular endurance training focuses on performing exercises for a greater number of repetitions, usually 12 or more. The 55% to 65% intensity range facilitates this by striking a balance between weights that are sufficiently challenging yet light enough to allow for sustained activity. As a result, muscles adapt to prolonged exertion, which is the primary goal of muscular endurance training.

Understanding this concept also helps in differentiating goals such as strength and power training, which often require heavier loads and lower repetitions. This distinction highlights why this statement is specifically aligned with the objectives of enhancing muscular endurance rather than other fitness components.