Fitness is key to good health. But we tend to limit ourselves to one or two types of activity. People do what they enjoy, or what feels the most effective, so some aspects of exercise and fitness may be ignored. In reality, we should all be doing aerobics, stretching, strengthening, and balance exercises. Here, we list what you need to know about each exercise type and offer examples to try. FITNESS EXERCISE GUIDELINES: A. Health-related components of Physical Fitness : There are five compone...