Final answer:
Tennis primarily helps improve cardiorespiratory fitness through sustained physical activity that elevates the heart rate and challenges the cardiovascular system. It also enhances muscular endurance as it requires playing for prolonged periods without fatigue.
Step-by-step explanation:
Tennis is a sport that can help improve several areas of fitness due to its dynamic nature, involving continuous movement, sprints, and a variety of shots. One of the main health-related components of fitness that tennis would most help you improve is cardiorespiratory fitness. This is because playing tennis requires sustained physical activity, which elevates the heart rate, and challenges both the heart and lungs to supply oxygen efficiently over the course of a match or practice session.
Tennis can also have a positive impact on muscular endurance, as playing for a long time without tiring is essential. The repeated actions and rallies during tennis matches work the same muscle groups for extended periods, enhancing their ability to use oxygen and sustain contractions. Although tennis can boost muscular strength and flexibility to some extent, and contribute to healthier body composition, the most significant improvements are likely to be seen in the areas of cardiorespiratory fitness and muscular endurance due to the aerobic nature of the sport.