When serving at the altar, one is doing just this: actively assisting the celebrant in the worship of God.  This is an important  ministry and should be approached with dignity, humility, and care.  The server should be well acquainted with the responsibilities and perform the duties with diligence.  Sloppiness is to be avoided; stiff or artificial movement is to be avoided; careless or unseemly behavior is to be avoided.  In all things, the server must be aware that the purpose in assisting at the altar is “that God may be glorified.”