Of course we all know that entertainment, sports, other events, special or everyday activities would be nil if humans could not function.
But what reason could possibly prevent bodies from not operating?
Observe the drummer, whose arms swing swiftly back and forth to beat hard upon his drum! Watch football players with their limbs in full action, screening and ploughing on top of other players! Observe the singer, who tightly holds her microphone while kicking, stomping and hopping on stage!
For humans, therefore, any fast or slow activity in life would be nil if bodies did not have skeletons.