I'd like to flex a simple tube, and capture that flex in an animation. I'd seen multiple videos online, such as a mandrel pipe bender animation, but all pipes in the video have a contact with another part. For those videos, I assume that specific dimensions on the pipe sketch were driven, there is contact between those two parts, and a motor runs the non-pipe part.

I don't want to do any of that. I just want to animate one tube flexing under motion study. What's the simplest way to do that?