I do have to say that I am recovering from soar legs yesterday and today. Kind of expected it and may break from my usual training today. Great part was I felt no fatigue on the way up and kept waiting for the usual burning or fatigue. None. However, my legs were fatigued by the time of the car ride home. Lots of downhill stomping ( kind of jogged it). That being said, this has been the best hike experience ever when not have to carry the extra weight. Maybe I will try running this trail later in the summer, when the snow is gone. BTB, may check out those vibrams after all. It would probably be about 4-5 % grade, but someone do correct me if I am way off in that guess. I am training during the week currently with 1-2%, but hope to get up to 3-4% in the coming months for 5-10k distances. Now, where is that hot tub when I need one to soak my legs!! And the Epson salt!! Lol.