Super defiant four year old.

[Marrow]

We missed the bus for swimming last week because of useless mass of inertia syndrome, which had the natural consequence that we had to trek across the park to catch a different bus. I am hoping that we will catch the one we intend to this week!

[ches]

I suggest the "drop in" technique. The further along a sequence you can "drop in" the more likely the child will complete the sequence without resistance. E.g. "Go brush your teeth please." <resistance> "Here is your toothbrush with toothpaste." <brush brush>

It's one part not dignifying the defiance with a reaction/setting a non-verbabl expectation of compliance, and one part capitalizing on our brains' liking of sequences and patterns.