Having a gym at home is becoming more popular, for a number of reasons. These include both financial and privacy reasons. Here are the details:
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A home gym is a one time expense, whereas a gym membership is at least a 12 month contract. Not only that but the cost of a membership is expensive and they cannot be cancelled. This locks people in to an obligation that most people never benefit from.
Having the privacy to exercise at home is something that most people like, and why more people are choosing to do it. When at home, you can dress in any way you want, not have to wait to use machines, and not have to worry about what other people are thinking. This freedom is something that is enjoyed, especially by women.
Another factor for the rise in home gyms is the simplicity of most people's needs. The majority of people only use a cardio machine at the gym, so there is little point going there. If you buy your own treadmill or exercise bike, then you can have a gym at home for a fraction of the cost. These are the reasons that people are choosing to workout at home.