He wants the thickest/fullest air mattress underneath him.
If it isn’t full of air, it’s much easier to do damage and get unnecessarily injured.
It’s similar in marriage.
When someone messes up, which we all do, they are going to land somewhere.
Sometimes they land on a huge, soft, full air mattress.
Other times, it’s not so full.
What do you think fills up the air mattress?