One thing you can try: actually stop after those 5 push-ups. Actually stop after editing that line of the code.

The idea is that I need to build tolerance for that task. If you keep at it, those 5 push-ups will become so easy that you will feel compelled to do more.

If it's not working, then there's another reason behind the resistance. Maybe what you're trying to do feels pointless. Try to notice your feelings and internal dialogue when you're trying to do that particular thing.

Or just make the task smaller and smaller. Can’t finish 5? Do 1! Too much? Just get on the floor and hold the position. This strategy can’t fail, as you can always reduce your goal (and next time have to reduce it less)

I agree and it's important, at the same time, not to trick yourself or push yourself. If you don't feel like doing more, don't. With time, you'll want to do more.

Right. Eventually the task gets so small, it's easier to do it than to cut it into yet smaller pieces.

What's happening is you are procrastinating doing the reverse-procrastinating. haha

You can start by doing something you actually LIKE doing - no tricks.