Definitely a great and rewarding challenge as parts can be very steep. Path is pretty narrow. If you want to good workout pick this. Not someplace I would go alone in case you get hurt because it can be very secluded and most of the areas.
While not a difficult trail for experienced hikers, Robin Hill did provide a few steep hills. Scenic and well kept, the multiple sub-trails provided a quick hike. The restored log cabin at the start was a bonus.