The Backyard CRUltra is physically demanding.  Participants should have sufficiently trained and prepared for this event.  This event includes both grass and dirt/unpaved sections with hazards that may include uneven surfaces, tree roots, loose rocks, wet areas, and steep drop offs near the trail, wildlife, such as snakes, insects, and other "varmints",  and the possibility of unpredictable weather.  This event continues into the night hours and entails running in the dark.  Runners are responsible for bringing and using necessary clothing and gear to both see and be seen.