There are never days when I physically can't run...but my brain is what prevents me from running some days. It can always find an excuse not to.
On the days when I've planned on running (3-4 days per week) when I don't feel like it sometimes I go home after work and drink and think about how much I hate my job lol...or sit around and watch TV and zone out. Not healthy ways of dealing with stress at all.
I'm trying to break myself of this habit by making detailed plans for every day of the week. That's how I usually manage to stick to it.
Well, I was thinking inclement weather. No matter where you are there can be a bad day ;)
I'm guilty of veg days too. Sometimes they are necessary. But if you find yourself taking too many of them, then you gotta reevaluate, lol.
The detailed planning is a great idea.