Not a climber
Spokes Etc. on Quaker Lane in Alexandria has a Sunday morning ride at 8:30am that goes through Arlington and Falls Church. Usually a pretty lively group that does 30-40 miles. Technically a no drop ride, so they'll wait for people at certain points along the route. Lots of rollers and usually one or two decent climbs. Not mountains by any means, but Barcroft lake has some high teens inclines and the 3 bears climb/Military Dr certainly suck towards the end of a ride.