Heart Rate Recovery Indicates Fitness

Steps:

• Identify resting heart rates: Both X and Y start at similar baseline levels before exercise.
• Compare during exercise: Pulse rates rise similarly for both due to identical speed and duration.
• Analyze post-exercise drop: Y's heart rate returns to baseline faster than X's.
• Conclude fitness: Quicker recovery signifies better cardiovascular fitness.

Why D is correct:

• Fitness is defined by rapid heart rate recovery after exercise, as trained individuals' autonomic nervous system restores homeostasis faster.

Why the others are wrong:

• A: X's heart rate recovers slower, not more, so X is not fitter.
• B: X's slower recovery contradicts X being fitter.
• C: Y recovers more quickly, not just "more," indicating speed of recovery matters.

Final answer: D