A long climb followed by an equally long downhill makes this a really fun loop. Starting at the end of the Hartwood Acres Red Loop
you can jump across the paved road/walk lane and follow the blue blazes.
The trail starts with a long climb, about 0.75 miles long. It's not steep but noticeable. At the far end of the trail, you'll make a hard turn that brings you back downhill on the south side and intersects itself a tenth of a mile north of the start.