Why does running require greater muscular strength compared to walking?

Running requires greater muscular strength compared to walking primarily because of the greater number of muscles contracting during the activity. When running, there is an increased demand for power and stability, which engages a more extensive range of muscle groups, particularly in the lower body. The muscles not only have to propel the body forward but also need to absorb impact and maintain balance as the body moves in a more dynamic manner.

As speed increases during running, muscle fibers must act more forcefully and quickly to generate propulsion and manage the increased forces of landing and liftoff. This greater engagement of muscle groups helps to enhance performance but also necessitates a stronger muscular capability to successfully execute the movements required during running.

In contrast, walking involves a more rhythmic and less forceful contraction of the muscles, requiring less overall strength. The differences in activity intensity and requirements underscore the importance of muscular strength in running as opposed to walking.