I really enjoyed this hike yesterday (a Fri.) The ascent (counter-clockwise) to the peak is a workout, but definitely doable with some breaks. You do have to deal with a very rocky trail near the top, not a scramble, but probably challenging if not in decent shape. A bonus about this area is that another 3.2 loop (Jack Albright Trail) trailhead is accessible from the Humpback Rock trailhead parking lot. And you can add on to either as the AT is connected to both. The JAT loop was a perfect 2nd hike after doing the HR loop, basically a walk in the woods. Ranger mentioned that he estimated about 6 bears were active in the vicinity. Only saw many people on the up and back to the HR summit.