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.