The type of exercise primarily focused on improving muscular endurance is called endurance training. This typically includes activities that involve lifting lighter weights with higher repetitions or engaging in bodyweight exercises. Examples of such exercises are push-ups, squats, and planks. The aim of endurance training is to increase the ability of muscles to sustain prolonged activity without fatigue. This type of training is essential for activities like running, swimming, or cycling, where stamina is critical. By developing muscular endurance, individuals can improve overall physical performance and maintain functional activities during extended periods.