We practice, not because we enjoy it everyday. We practiced so we are prepared for when we are required to perform. If we have seen it already in practice, performing is a matter of repetition.
But sometimes, preparation allows you the opportunity to not engage. For if your opponent knows that you are prepared for war, maybe that in itself averts war.
There appears no reason, therefore, not to make time to prepare. Whether for protection or competition, preparation improves our chances of success.