Asim bin Damrah says that once we asked Sayyiduna Ali (may Allah be pleased with him) how the Prophet (peace and blessings be upon him) used to offer voluntary prayers during the day. He replied: You do not have the strength to pray as he did. We said: Please tell us, we will try to act upon it as much as we are able and capable. He said: The Prophet (peace and blessings be upon him) used to offer sixteen rak‘ahs during the day apart from the obligatory prayers.