Which term best describes a method of training focusing on the ability of both the heart and lungs during physical performance?

The term that best describes a method of training focusing on the ability of both the heart and lungs during physical performance is cardio-respiratory endurance. This concept refers to the efficiency with which the body can deliver oxygen to the muscles during prolonged physical activity and how well the muscles utilize that oxygen. Cardio-respiratory endurance is an essential component of overall fitness and is typically enhanced through aerobic exercises such as running, swimming, cycling, and other activities that elevate the heart rate and promote sustained exertion over time.

Dynamic training primarily relates to the use of various movements to improve physical performance, but it does not specifically target the heart and lungs' functions. Strength training focuses on increasing muscle strength and mass, while flexible training emphasizes improving the flexibility of muscles and joints rather than the efficiency of the cardiovascular and respiratory systems. Therefore, cardio-respiratory endurance is the most accurate choice for describing training aimed at enhancing the heart and lung capacity during physical performance.