Haha, swimming in the summer is a good thing, but you can't blow the air in front of the air conditioner, and it's not easy to get rid of a cold in the summer. It's also a holiday, and he has wasted all his time in bed. He must be super depressed.
Haha, as a friend, you can really visit him, joke with him, and let him know that good friends are the most loyal. Of course, it is also recommended to give him a small gift. Boys don't need to bring flowers, which feels a bit inappropriate.
If he likes games, you can give him the latest game, but tell him to control the time he plays games, because health is the most important.
In addition, you can also find a store to customize a real doll and make it into his sports style. He will like it too, which means that he hopes his friend will get well soon.