Is there a particular area you are interested in? There aren’t very many left. The best trails are the ones over near Fountainhead, Hemlock, or Bull Run Marina. You can pick up some trails off of Willowbrook, but if you don’t live on Willowbrook, they are difficult to get to.
Living in a subdivision on the power lines makes things easier. English Hills still has decent access, as well. There is a loop around singing woods/yates ford road, but it is pretty boggy, rocky, and has some barriers nowadays. (One area has a such a deep bog my horse pulled a back shoe, but there is barbed wire, and you can’t avoid it.) I got yelled at the last time I went out on it, as the trail skirts a subdivision, and it is either walk a ways on cement, or the edge of someones yard. There are some along Wolf Run Shoals road, but the cars go so fast they make me nervous.
There used to be so many. Now they are few and far between. If you can find trails to link you to the parks, those are still very nice.