I came across a post from this site while reasearching commuting times from Springfield to the Pentagon. I haven't given myself the opportunity to get out and ride lately as much as I used to. I have an old Schwinn mountain bike that works fine for me. I like to ride the trails along the creek by my house off Pohick and also Lake Accotink. Looking forward to learning about trails from this site and will share as I come across more.