Cardiorespiratory endurance is the ability to:

• A. maintain balance while standing on one foot
• B. sustain prolonged physical activity by efficiently delivering oxygen to muscles
• C. increase muscle size through resistance training
• D. generate quick bursts of speed

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the concept of cardiorespiratory endurance. It refers to the ability of the cardiovascular and respiratory systems to supply oxygen to the muscles during sustained physical activity.
2. Step 2: Analyze the options provided in the problem. The correct answer should align with the definition of cardiorespiratory endurance, which involves prolonged physical activity and efficient oxygen delivery.
3. Step 3: Eliminate options that do not match the definition. For example, maintaining balance while standing on one foot is related to balance and coordination, not cardiorespiratory endurance.
4. Step 4: Similarly, increasing muscle size through resistance training is associated with muscular hypertrophy, not cardiorespiratory endurance. Generating quick bursts of speed is related to anaerobic power, not sustained activity.
5. Step 5: Select the option that matches the definition of cardiorespiratory endurance: 'sustain prolonged physical activity by efficiently delivering oxygen to muscles.'