Very good work-out trail. You can get rather consistent incline all the way from Glen Canyon to the top of the twin peaks. The Glen Canyon portion is extremely pleasant now after the park renovation. Walking in the canyon, you forget that you are in the city, because you are surrounded by woods and don’t see paved roads/vehicles — that is one unique characteristic of Glen Canyon making it a better hike to me than other nearby hills such as Bernal height. Reaching the twin peaks is quite rewarding with The unobstructed view of downtown. The only unfavorable part on this trail is that you need to cross a big intersection with traffic light, and then cross back and forth on the vehicle road leading up to the twin peaks several times.