What's This About An Internet Push-Up Challenge?

I did 55 push-ups yesterday.

I started by thinking I would do 3 sets of 10.

On a Bosu ball.

Then, I figured, why not add a few. So, I brought it up to 3 sets of 15.

Good push-ups, with plank like form, and deep elbows to bring my rib cage all the way down to the ball. NO bend at the hips. Head, neck and back all in good alignment. Breathing deep.

That's because the guys at work are always checking out my form.
They can't help themselves.
It's their job.

And it keeps me on my toes.

My co-worker, S. (of course, checking out what I was doing) came bounding over with two bolsters in this hands. "Have you tried this?"
He said I looked bored.
So, he set me up with one palm on each bolster, laying lengthwise, parallel to me, and had me simultaneously push each bolster laterally away from me as I lowered, then pull them in until they were under me as I pushed up.
Boredom hadn't really crossed my mind, when I was doing the initial push-ups.
In fact, I thought I looked like I was concentrating on my form and breathing--and making it to the last push-up of the last set.
But these new push-ups were fun.
And challenging.
So, I did 10, then ran out of time.

Good thing I was saved by the bell.
My pecs and delts (anterior) are remarkably sore today!