Ibn Abbas (radi Allahu anhu) reported that the Messenger of Allah (sal Allahu alaihi wa sallam) said, “There are two blessings in which many people incur loss. (They are) health and free time (for doing good).”
1. Al-Ghabn in Arabic means loss. What it really signifies is to sell something of one’s own on less than its due price, or to buy something on its double or triple price. In both cases one is a loser. When a person comes to know about such a loss, he repents and feels sorry for it. This loss coupled with regret is called Al-Ghabn. In Ahadith, man has been compared with trader, and health and leisure enjoyed by him with merchandise. One who uses his merchandise with care, gains profit while he who wastes it, that is to say, uses it carelessly, will be a loser on the Day of Resurrection.
2. The majority of people do not take proper care of both these things, with the result that one wastes the time in useless activities and spends the physical strength and energy in the disobedience of Allah. One will have to face severe consequences of it on the Day of Resurrection when he will be brought into account for everything.
And Allah Knows Best!