What is the meaning of ability in the expiation for intercourse in Ramadan?

The questioner : The questioner says: The hadith you cited about the man who had intercourse with his wife in Ramadan indicates that the man was strong and that he was able to fast, because he was fasting in Ramadan. However, since the month is overwhelming, there must be the ability to fast for two consecutive months, especially since it does not appear that the man is unable to stand, because the Messenger of Allah (peace and blessings be upon him) asked him about his ability.

The Shaykh : Our answer to this is to say to the brother: What makes you know that this man is able?
A person may not be able to fast despite being strong in desire. We have heard of many people who are thin and weak, yet they are able to have intercourse with intensity and strength. So, the ability to have intercourse does not imply that a person is able to fast. How many people are there who cannot fast because they cannot endure thirst or cannot endure hunger? This man may not be able to fast because he cannot endure hunger, and it may be this food that gives him the strength for intercourse. What do I know about this? In truth, this questioner, or this man who said to the Prophet (peace and blessings be upon him), "I am not able," may not be able to fast because he cannot endure being away from his wife and cannot hold back until night. This is an inability. He may not be able for another reason in his body. The important thing is that the Messenger (peace and blessings be upon him) said, "Are you able?" A person is responsible for himself before Allah, and he is the one responsible for himself before Allah. So we say to him: Are you able to fast for two months? If he says, "I am not able," we say he moves on to feeding sixty poor people, and he is the one who holds himself accountable. Yes.