Runners will be on the streets and trails of south Reston Sunday for the Perfect 10 Miler/10 K Race.

Runners choose between the 10-mile course or one that is 10K — about six miles — in this annual event in the =PR= Race Series.

Here is what you need to know:

The race begins at 8 a.m. and starts and finishes at South Lakes High School.

There will also be a one-mile fun run beginning at 8:10 a.m.

The race benefits area track and cross country programs.

Streets will not be closed, but lanes may be blocked on the course. Affected streets:

Perfect 10K – South Lakes Drive, Sunrise Valley Drive, Soapstone Drive, Twin Branches Road, Glade Drive.

Perfect 10 Mile – South Lakes Drive, Ridge Heights Drive, Colts Neck Road, Soapstone Drive, Twin Branches Road, Glade Drive.

Online registration ($45) closes Friday at 5 p.m. In-person registration at packet pickup Saturday and on race day is available (pending a sellout) for $50.

Race participants get a tech T-shirt. Division winners get cash prizes.