We just came back last night from this loop,went from Stanton to resolution shelter night 1. Then davis path to isolation down to rocky branch shelter 2. Then down rocky branch,up stairs col, and then to langdon path out. Depending on where on rocky branch you are planning on running some is not bad. I am not a runner but from r.b. shelter2 to r.b. shelter 1 is pretty flat and probably woulnt be bad. Keep in mind that section has 4 major river crossings and if it has been raining i would not reccomend this path. Up from r.b. 2 up isolation to davis path is pretty rocky in a lot of areas and probably not real good. Some of davis path would probably be not bad , iguess that depends on your abilitys as a runner , steep in spots, not in others, hope it helps, have fun.