The following are local Southern California hikes that are excellent for conditioning and getting used to long days of hiking at elevation. These hikes are located in the San Gabrial, San Bernardino and San Jacinto Mountains.
altitude sickness is a very possible outcome. Everyone is affected by altitude differently. Training hikes is a good way to determine how your body reacts to high altitude physical exertion. The more time that you can spend at altitude just prior to your hike the better off you will be. Horseshoe Meadows (10,000 ft) is an excellent place to spend the night to begin your acclimatization process.