The YMCA 3-Minute Step Test is used to estimate cardiorespiratory fitness. In the NASM CPT7 Study Guide, clients who score average on this test should begin cardiorespiratory training at a target heart rate zone of 65% to 75% of their estimated maximal heart rate. This ensures they are challenged enough to stimulate cardiovascular improvement without causing undue fatigue or risk, aligning with Zone 1–2 intensities for aerobic base building .
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