If you are a weight trainer who is looking for additional ways to make money in your career, consider writing a book on weight training. There are many people who are interested in learning how to lift weights, but they do not know where to start. They may not know anything about weights, how much to lift, how to lift or even whether they should lift weights. For these people, going to a gym may be too intimidating for them, and so in light of their confusion and indecision, they simply do nothing. But if you wrote a book that explains weight lifting in simple and understandable terms, they could buy it and begin their own program. You could start with the very basics, for example explaining the difference between free weights and stationary weights, and move on to more complicated topics, such as nutrition requirements during heaving lifting weeks.