The reason humans switch from walking to running when they locomote at speeds exceeding 2.5 m/s is that

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When walking at speeds exceeding 2.5 m/s, the period of time that the foot spends in contact with the ground becomes too short to provide enough time for the body to be supported against gravity. This means that, without speeding up the gait or switching to running, the body would fall more quickly than gravity permits, resulting in a loss of balance and potentially a fall. Running, on the other hand, involves a period of time when both feet are off the ground and the body is propelled forward by coiling and recoiling of tendons and other elastic structures, which allows for a more stable form of locomotion at higher speeds.

The Reason Humans Switch from Walking to Running When They