I think you will all be justified in leaving threatening user notes after this, as I have made two mistakes in the past two riddles I've done. Yes. I'm ashamed. However, I have an amazing ability to correct things. Yey!

Not once, not thrice, but in between.
Our loyal companions can be seen.
With friends by side, and running behind
They really are not hard to find.

"Shakespeare only names us once!" they say,
But tell me, friends, what are they?

It probably doesn't help you much anyway, it's just for my own piece of mind


And nope. Not running shoes.