Practice "rig" from pallets?

I’m nowhere near ready yet, but I like to plan ahead.

I’ve seen a few videos where people use old pallets to make up “rigs” to practice on. We always have a few pallets going spare at work as well as odds and ends of other wood.

If you could build a “rig” to practice skills on I.e.hopping up/down stairs etc, what sort of set up would you make? Looking for ideas so I can start planning and squireling away the bits I need to construct.

Here are some really elaborate ideas. These are all way more than you need when you’re just starting out. For learning the basics, a few pallets and some kind of skinny thing to ride along is enough. You can build a skinny out of a few boards.