budmball

I am sure this topic has been discussed before. However, I would like to consult the members of the forum about it. The whole class had a debate with the physics teacher and it left all of us even the physics department baffled. Is running a marathon considered work done considering that the runner has exerted a force and due to such an exertion it made his body moved. I would prefer a detailed answer to my question as I hope to take the replies to class so that we can debate on it further.