Nothing on the shelf, it will just add clutter and potentially get broken.

I also agree: nothing on that shelf

Agree with above and nothing on window if you don’t need privacy, so as to let as much light in as you can.

It acts like a shelf, but it really is more like wainscot trim. Don't put anything on it.

We don't think you need to add anything to the shelf. Though you could easily add a piece or two of artwork on the shiplap. It could add something lovely to look at while working out.

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I would lean my framed art pieces on it rather than hanging them. No other decor on it, A living plant in the window.