Ascension Dementia

When it comes to penthouse parties, I’m an equivocator
if it is a building that lacks an elevator.
Lately, my flair for climbing stairs seems to be out of whack.
When it comes to floor ascension, I do not have the knack.

My gumption seems to flag a bit as I reach the brink,
for as I run short of breath, I simply cannot think.
Thus, I’m an oxymoron, for when I climb the stair,
my mental acuity simply isn’t there.

At the bottom I am boisterous and have a lot of pep
that vanishes too quickly as I take step after step.
I try to remember what I climbed nine stories for,
but I can’t for the life of me remember anymore.

(According to poetic lexicography, an oxymoron is someone who loses mental acuity due to oxygen loss to the brain.)

Prompts today are flag,  gumption, oxymoron, whack and boisterous.