If you're at home, there's no reason not to just do 10 pressups right there and then (and as you get better, 20, 30 and so on). Or dips with your chair if you can't do pressups yet.
And in my opinion are entirely missing the point because they take more pre-planning and effort. Even if only a little.
The problem people are trying to solve is "how do I go from nothing to exercising even a little?" The problem you are helping them solve is "how do I get more/ the most out of my workout?"
It's a serious pet-peeve of mine. I know you mention it with good intentions, but people often try to help others by telling them their personal favourite item, vs helping them solve their problem.
People do similar with programming languages. For a one off project or getting started sometimes a shitty language is the best way to help someone for their specific problem.
1. http://exrx.net/Kinesiology/Posture.html
2. https://www.theptdc.com/2014/07/upper-crossed-syndrome/
As for programming languages, I've sent "pull requests" for AutoHotKey programs via Reddit PM before. If it's the right tool (or a decent one) for the job...
you need it to be a kind of mediating objective to not lose that pledge. otherwise, the inevitable abandonment comes after exercising a handful of times, if that :P
my intuition tells me you'd need a goal that has pushups (or exercise at all) only as a subcomponent along the path towards the attainment of that goal. hopefully it would persist longer than if solely working out were the goal. so that it doesn't feel "empty" or easily abandon-able after doing it a few times.