I'm in the DC area.
Many of my friends are federal workers; it's hard on them. I don't know anyone who is financially struggling yet, but it's hard for other reasons - it's not a vacation - more like jury duty, where you have to check each day to see if you have to come in.
And their work deadlines are not extended as a result of the shutdown, and their ongoing work is piling up - my friends who are non-essential would, for the most part, prefer to be allowed to work without pay so that they could at least stay on top of deadlines.
The bathrooms on most of my running routes are padlocked (this one really hurts, trust me). One of my preferred locations for road workouts (Hains Point) is supposedly closed, with uniformed officers ordering people to turn around rather than enter (though they're not there all the time, and it's easy to hop the gate).
Many of the local DC races are on NPS property, and so could be cancelled if the shutdown continues.
Traffic is much lighter than normal; metro noticeably uncrowded.
The gym has not been packed at 6:30 am, despite it being resolution season - I suspect that this is because a lot of people are hitting the gym mid-day since they're not working.