Final answer:
The three-minute step test is the right choice for evaluating cardiorespiratory fitness as it measures heart, lung, and muscle performance during activity.
Step-by-step explanation:
You can evaluate your cardiorespiratory fitness by performing a three-minute step test. This test is designed to measure how well your heart, lungs, and muscles perform during moderate to vigorous physical activity. Options such as partial curl-ups and right-angle push-ups assess muscular strength and endurance, while flexibility measurements check the range of motion of your joints. To specifically test cardiorespiratory fitness, the three-minute step test is the most appropriate choice from the options given.