Fresh Air For Office Shed

Hello all,

I am in the process of building an outbuilding for my gym equipment (12x12) and am now wondering if I should be including some type of fresh air system. For background, my house has radon issues from time to time and I installed an ERV to mitigate those (with success, validated on Airthings).

The outbuilding is pretty air-tite (zip and liquid flash detailing), so I'm wondering if I should be introducing some type of fresh air from time to time for dilution? The flooring will also be rubber mats, so if not radon, it probably makes sense to dilute for any VOCs that build up in the space. I suppose I could just open the windows and ventilate that way since it's a small space, but wanted to get folks opinion on if there are any easy ways to accomplish this that I'm not thinking of.