If I only had a nickel for every time I hear this. What you really mean is you don't want to work out because it competes with other things you want to do and need to do and this one feels like it is hard in comparison to everything else you do. This is the same reason people eat poorly instead of trying to cook and eat healthy.
It's not that you don't have time, even President Obama has time to work out. Some of the CEO's of the largest corporations find time to workout. Everyone has time if they want to make time.
What constitutes making time? Is is 20 minutes? One hour? More? It is whatever you feel comfortable with, as any movement is better than none. Although you need larger blocks of time to create a high level of fitness, you need very limited discreet amounts of time to reduce risk of disease and promote good health and wellness. According to the American College of Sports Medicine and the Surgeon General, this could be as little as 10 minutes 3 times a day.
Just walking after a meal can make a dramatic difference in your glucose uptake and fat storage mechanisms. When coupled with some reasonably decent eating habits, your health risk profile can improve dramatically.
So even if you don't join a gym just go out and move for a few minutes. And if you do join a gym, there are many ways to get in and out in less than 30 minutes. If you have a little discipline and desire you can achieve surprising fitness with very little time by knowing how to make science work for you rather than against you. We are even working on a 10 minute routine that will knock your socks off. It is not for everyone, but for those who wish to put in the effort, extraordinary returns can be had with some very short time periods each day. It's not the 80's anymore, why train like it is? Find somebody who has the scientific and medical knowledge to know how to create health gains by optimizing your body chemistry through movement and nutrition. In the end, it's all about the hormones and creating a youthful environment inside your body.