One large unfortunate cost of the current technological revolution, which is due primarily to the wide use of the automobile, TV, and computers, is that many Americans are becoming "couch potatoes." They do not bother to exercise any more than the absolute minimum to get around their houses and offices and to their cars. More and more time is spent in front of either a computer or a TV set. Many are getting quite, if not extremely, obese. Many are also prone to heart attacks and other bad diseases from all the toxins that accumulate in their fat.
With the growing time pressure (and big-industry advertising pressure), many people are buying quick, convenient "junk" food. This is not helping their nutrition and long-term health at all either.
Walking is the easiest and least stressful form of exercise. It is much better if you walk for a fair distance (at least for twenty minutes or one mile). It's also better if you avoid auto exhaust while you walk. A couple of excellent books on walking for exercise are: Aerobic Walking - The Best & Safest Weight Loss and Cardiovascular Exercise for Everyone Overweight or Out of Shape, by Casey Meyer, and The Joy of Walking: More than Just Exercise, by Stephan Christopher Joyner.
Many more people are jogging, biking, and/or buying expensive treadmill or other machines to use indoors. This is all very good, but you need to take at least two precautions (especially if you are starting to exercise for the first time). These are:
An excellent source of more information on exercise and nutrition are the books Opnimum Sports Nutrition by Dr. Michael Colgan; and Fitness and Health by Brian J. Physiology.
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