If your home feels stale, “house burping” might be the simplest fix—at least according to a new TikTok trend. Originating in Germany, this method of briefly opening windows and doors is quickly catching on worldwide.

A once-beloved workout staple now appears to be on the outs with social media tastemakers. TikTok users have weighed in, and the verdict favors brighter, bolder gym attire over the traditional “millennial uniform.”