Question

which of the following activities is least effective in improving cardiovascular fitness?
a. weightlifting
b. run
c. swimming
d. bicycling

Explanation:

To determine the least effective activity for improving cardiovascular fitness, we analyze each option. Cardiovascular fitness relates to the heart and circulatory system's ability to supply oxygen during physical activity. Weightlifting is a strength - training exercise that primarily focuses on building muscle mass and strength, with less emphasis on sustained aerobic activity that boosts cardiovascular fitness. In contrast, activities like running, swimming, and brisk walking are aerobic exercises that involve continuous movement and are highly effective for enhancing cardiovascular fitness as they increase heart rate and improve the efficiency of the cardiovascular system over time.

Answer:

A. Weightlifting