We recently moved from Victorville to Hunter's Ridge, Fontana. Almost every day I spend about 2 hours walking from my house up into the foothills of the San Gabrial Mts. Etiwanta Ridge is a good work out for sure.
To San Sevaine LO and Buck Point with Travis and Bechtt. It is unquestionably a nice route and will give you a workout. Just looking at an image of the ridge sweeping upward in curves and waves makes you want to climb it.
"So I was sitting in my cubicle today, and I realized, ever since I started working, every single day of my life has been worse than the day before it. So that means that every single day that you see me, that's on the worst day of my life."
--Peter Gibbons (Office Space)