This is becoming one of my favorite trails.  I start at the N. Mtn visitors center and take the long, rocky, but definitely worth it trail up to the towers. I have been trying to run most of it but I always get winded once I get to the base of the incline. Be careful as it is pretty rocky and your trip down can be dangerous if you are not careful.  Especially if you tend to run down like I try to do.  I am happy to say I am not as winded as I use to be when I first started visiting this trail. One of these days I will run from top to bottom.