How tight do those who ride with clips and straps keep their straps?

My son rides a geared bike and prefers clips and straps to clipless, and he tightens his straps down so tight he can't pull out of them.
However, he can easily tighten and loosen his straps because he can coast.

What about those who ride fixed gear bikes with straps?
How much do they tighten them?
Do they keep them loose enough so they can pull out of them, or do they tighten them down and loosen them on the fly?