It seems like the actual correct play would be to go and DO HARD THINGS.
Hard things where you are still in control.
But the amount of hard things that you can effectively do during a short bus ride is limited.
I personally like standing in the bus without leaning on anything and read a book. All stability that I need gets provided by standing on my own feet.
I've done this fairly often (I wouldn't call it particularly hard, but I'm used to reading and walking at the same time, so I suppose that probably functions as practice,) but I don't think it functions as useful practice for doing anything else that I might plausibly have reason to do.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.