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Muscular endurance refers to the ability of a muscle or group of muscles to perform repeated contractions over a period of time without fatigue. The method that is most effective for improving this aspect of fitness is high repetitions with lighter weights.

When using lighter weights, individuals can perform a greater number of repetitions, which helps to build stamina in the muscles. This approach not only enhances the ability of the muscles to sustain prolonged activity but also increases the efficiency of the energy systems involved in muscle contraction, specifically the aerobic energy system.

The other methods do not effectively target muscular endurance. Heavy weightlifting for low repetitions focuses on building muscular strength rather than endurance, as it promotes the development of maximal force for a limited number of repetitions. Extended cardiovascular workouts, while beneficial for overall fitness and cardiovascular endurance, do not specifically enhance muscular endurance as they primarily engage the cardiovascular system rather than isolating muscle groups for endurance training. Static stretching exercises are important for flexibility but do not contribute directly to the endurance capabilities of muscles.

Therefore, the correct method for improving muscular endurance is high repetitions with lighter weights.