A crowded train.

Often thought of as a painful and bitter thing to suffer through. But that's not true at all.

It's only hard when you try to force yourself through the stream of people.

But if you free your mind and entrust your body to the stream, it becomes surprisingly easy.

By standing in a way where you could direct the side of your body toward the direction you want to move to, while keeping your balance. You could move there without any trouble.

Also, by doing a certain thing, you could even sleep on a train like this.

And that is...