It's tough to run in the snow. It's tougher to run in the solid snow. It's absolutely grueling to run in the hard snow that breaks just as you take a step.
Pros:
I thought that Friday's super heavy route for the muscles would slow down today's run, but no, it was really OK to run.
Cons:
Snowy trails in the fores were in a terrible condition: deep, narrow and bumpy, and snow was solid.