Temp 34 - very nice weather. Ran from Down Dog parking lot and did U St loop (M/NH/Connecticut/U/9th/Const/Rock Creek. Then went out on Cap Crescent to stairs, and back via towpath to 33rd.
Hamstring actually felt quite good - I focused on using it correctly during the first mile, and my form felt good until it faded a bit the last mile.
Feet were crampy the first two miles. Shoes also would NOT stay tied.