One of those

You always hear that today is "one of those days."
I never quite understood what that exactly meant until today.
"Those days" are extremely cliche.

Well today is "one of those days" in every possible way.
Today it's absolutely beautiful outside and I can't seem to drag myself out of the house to enjoy it.
I'm not feeling my best, but you would think I could use some fresh air.
It's close to 60 and the day is almost spent, I feel extremely blehhh.

Oh well, I guess it's just one of "those" days.