One hard thing about rehearsals is to catch and keep the musicians attention for hours. Some of the best conductors I've met were really funny (like presenting

One hard thing about rehearsals is to catch and keep the musicians attention for hours. Some of the best conductors I've met were really funny (like presenting jokes/stand up comedy at pauses), charismatic, ,energetic and engaging (for hours)... Conductors are making their main performances at rehearsals, and they are having much less (and shorter/simpler) work during the actual performances.