When you feel like you're too busy to exercise, consider this: Exercise alleviates stress, gives you more energy and aids in clear thinking, making everything else you do go faster, easier, and more efficiently. It's quite possible that your time spent exercising will be made up for, without even trying!
Think about the things you do during your day. Are you on Facebook, playing computer games or watching TV? Shave time off of that to create time needed to take care of yourself. Another option is to do the things you need to do, smarter or faster.
If I know I have all day to clean my house, it can take all day for that to happen. If I get a phone call from someone telling me they're on their way to my house, it takes me the exact amount of time that I'm given to clean my house ... even if it's only an hour. This doesn't just go for housecleaning, and I don't believe I'm special in this way. This is true of just about anything. When the pressure is on, we can accomplish just about anything in the time allotted.
To fit exercise into your busy life, figure out a time that will theoretically work into your schedule. First thing in the morning, just prior to lunch, and after work are popular times for super busy people. Choose at least three times a week and write them on your calendar like you would a business or medical appointment. Make it a top priority, so it will happen.
Choose a form of exercise that's reasonable for you. There are many options to choose from. You can purchase exercise videos, pump iron, join exercise classes, walk, play tennis, hire a personal trainer, whatever you like.
If your scheduled time comes, and you think you don't have time, force yourself to take five minutes to do something. Stretch, walk, do jumping jacks, chair yoga ... anything! Everyone has five minutes. Everyone. What commonly happens, is that at five minutes, you may decide you can afford another five minutes, or 10, or more. You may wind up getting a whole workout in! I've seen it happen. Of course, if five minutes is truly all you have, then work hard during that precious time, and feel satisfied that at least you accomplished that.
Look at your scheduled exercise as a commitment that must happen. Look for ways to create time. Then spend that time doing something that will increase your energy level, help you think more clearly, give you a sense of accomplishment, help control your weight so you feel lighter, help deter illness and disease, improve your quality of life and perhaps lengthen your lifespan. You'll look and feel better in mind, body and spirit.