Count backwards

I don't remember this being an exercise for mental status when I attended school. Now it seems to be everywhere.

Count backwards
By sevens
From one hundred.
I lie in bed
And practice
For whatever
For whenever
Might be next.
Count backwards.
Maybe I'll get it right
Next time.
I sit in my chair
Think about
How ridiculous it is
To count backwards
By sevens.
I made it
To seventy-nine
Last night.