Ready or not pushups, here I go

Hurrah - I can still feel my arms! I'll get right to the point - I completed the suggested 5 sets of pushups for Day 1 of the 6-week program that is supposed to enable me to do 100 consecutive pushups.
Now then for you pushup purists, I admit I am doing "modified" (knee) pushups! There I said it, or rather I wrote it! And I don't feel bad about it - not one bit. It is still all about the arms!
To set the scene here, I will tell you, proudly, that for my initial test last week I was able to do 20 "modified" pushups. According to the www.hundredpushups.com program that puts me in column 3, for those completing 11-20 pushups, for suggested repetition sets.
Others at my elementary school are taking up this challenge and a log-in sheet has been posted in the teacher's workroom - for all to see. This morning I entered my name and the initial test amount of 20, noting that they were "modified" pushups. We're a pretty close knit staff and I don't want to appear to be bragging, but, yes, I am very happy to be able to do 20, even if they are from my knees.
All through the school day I keep having thoughts of "Day 1 of the Pushup Challenge". I know when I leave school I will have to leap into the fray, or rather get on my hands and knees and push up into the fray!
I took my time leaving school. I played with my daughter's cats. I had an orange. I looked at the mail. "Stop stalling woman," says the competitive spirit side of me. "Okay, okay," replied the more complacent , let's sit down at the computer side.
With no one home but the cats I find the program printout and lay it on the floor in my exercise space and breathe. Here goes. Set 1 - 10; rest a minute; set 2 - 12; rest a minute; set 3 - 7; rest a minute; set 4 - 7; rest a minute; set 5 - as many as possible (min. 9) - I manage 12. Whew! 48 pushups.
Okay - that wasn't so bad. During the rests I shook out my arms or did tricep stretches. Knees held out okay on the rug.
My initial reaction ... I am going to be The Little Engine that Could, "I think I can! I think I can!"