What type of exercise primarily improves muscular strength?

Resistance training is primarily designed to improve muscular strength. This form of exercise involves the use of weights, resistance bands, or body weight to create tension in the muscles, leading to adaptations that increase their strength and size. When engaging in resistance training, the muscles are subjected to loads that require them to contract forcefully, which stimulates muscle fibers and promotes strength gains over time.

In contrast, aerobic training focuses more on enhancing cardiovascular endurance and involves exercises like running or cycling, where the primary goal is to increase the efficiency of the cardiovascular system. Flexibility exercises, such as stretching, are intended to improve the range of motion of muscles and joints rather than strength. Balance training aims to enhance stability and coordination but does not primarily focus on developing muscular strength. Therefore, resistance training is clearly the method most directly associated with increasing muscular strength.