No matter where you work here in California, your job probably comes with certain hazards. State and federal laws require your employer to provide you with a safe workplace. What that means in your industry may vary from other workplaces, but the point remains the same -- your employer has a duty to protect you from harm.
Like most areas of the nation, California roadways are often busy, dangerous places. If you plan to get behind the wheel of a car to drive, you definitely want to be alert, aware of traffic regulations and ready to act at a moment's notice should an unexpected situation place you at risk for injury. The problem is that you can be a safe, cautious driver and still not be able to avoid a problem because you have no way of controlling other motorists' behaviors.
You've been at your job for a while. Every day is the same thing. Day in and day out, you perform the same functions, the same movements. After some time, you notice that these common movements are causing stress on your body. Repetitive stress injuries are a very real thing and, yes, in California, work comp benefits should cover them.