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Good health - Fitness
Fitness - The most basic measure of your fitness is the way your heart performs. The heart is a muscular organ whose contractions pump blood around the body and deliver the oxygen it contains (which enters the body through the lungs) to your muscles. Like all other muscles, the heart needs a constant supply of oxygen to function. Unlike other muscles, however, the heart has to work all the time to sustain life. Since it is a muscle, you can train your heart to improve its performance. The way to do this is to increase the amount of work your muscles are doing, by starting to jog, for example.
To meet the increased demand for oxygen from the muscles, your heart has to pump more blood around your body, so improving the efficiency of your heart also has an effect on your lungs, circulatory and respiratory systems. This type of training is known as aerobic (meaning using oxygen). Over time, as you train your aerobic system, your body becomes more efficient at taking oxygen from the blood. As this happens your heart starts to beat more slowly and strongly; because it has to do less work to achieve the same results.
Many people who decide that they wish to be fitter do so because of the obvious benefits to their heart, lungs and circulation. The other major benefit of aerobic work, however, is that it boosts your metabolic rate, that is the rate at which you burn food for energy. If you follow an aerobic training programme and eat sensibly, you should also lose body fat.
Not all activities depend on the efficiency of your body's aerobic system. The muscles themselves contain reserves of energy which can be called upon for short bursts of activity (running to catch the bus or train) or for some sporting activities - sprinting, for example. Your muscles work in this way for between 10 and 30 seconds before fatigue sets in: your muscles start to become heavy (this is due to the build up of lactic acid). This type of activity is known as anaerobic (meaning without oxygen). All exercise of high intensity and brief duration uses the body's anaerobic system. Depending on what you are looking for from a fitness programme, you can choose to train your aerobic or anaerobic system, or both. If you want to run a marathon, concentrate on aerobic work. As your heart and lungs start to work more efficiently you will be able to run for longer distances before you become tired. Other aerobic activities include stepping, dancing, roller and ice skating, cross-country skiing etc.
If your aim is to sprint or hurdle well, play tennis or squash or power lift
(the major anaerobic activities), concentrate on boosting your ATP (adenosine
triphosphate) reserves and your tolerance to the build up of lactic acid by
short sharp bursts of activity. In this way you increase the time before your
aerobic system comes into play.
It's easy to say "I want to be fitter": most of us say it often. Defining fitness, however, is more problematic. For a start, there are many different kinds of fitness. A marathon runner could not go five sets any more easily than a tennis champion could run a marathon. Yet both are supremely fit. Fitness also means different things to different people. Some of us do want to be fitter to play a sport, or we have a fixed ambition (to run a marathon, or cycle round Europe for example). Many of us, however, simply want to feel better, to look good, have some energy left at the end of the day, be emotionally stable and have some fun. We don't enjoy being overweight, tired and under constant stress!!
Fitness training can help you on all these levels. It will make you a better
sports player, if that is what you want, but it will also cut down your body fat
in favour of muscle (so you may lose weight) and tone these new muscles, thereby
improving your appearance. It will give you strength and stamina, help you relax
and improve your ability to sleep. Taking regular exercise increases your speed
of movement and helps your coordination and concentration. Finally, it promotes
the feeling of wellbeing that only comes from doing something by yourself for
Overall fitness - There's three main components to overall fitness, there's aerobic endurance; strength (often divided into muscular strength and muscular endurance); and flexibility. We all tend to be good at one or two of these (with flexibility the most neglected area), but your aim should be to reach a good standard in all three, and in every part of your body.
Aerobic exercise is vital: a strong, healthy heart and efficient lungs are the
foundations of a fit and healthy lifestyle. In later life, will you be able to
play with your grandchildren, or run to catch the train? Heart attacks do not
always happen to others and although many people recover from them, their lives
are never the same again.
Flexibility will keep you mobile as you age. It is a sobering thought that the
majority of mobility problems suffered by elderly people could have been
A word of warning - whatever your major aim, don't neglect the other
components of fitness: a whole-body approach is important. The aerobics
programmes include complementary strength exercises: use them. And, as you
strengthen a part of your body, stretch it too.
What Does Fitness Mean? - To some people 'fitness' means not being
ill, while to others it's a question of how long it takes them to complete a
What Constitutes Total Fitness? - Total fitness is made up of several
components. To evaluate your total fitness you need to consider your physical,
mental, and nutritional health status and your social and emotional skills
management. All these factors have a significant effect on each other and
contribute to your overall wellbeing.
Physical Fitness Components :
Cardiovascular endurance or aerobic fitness is the ability to maintain at least a moderate level of activity using the large muscles of the body (e.g. swimming, running or brisk walking) for a period of time - usually a minimum 15 to 20 minutes - long enough to produce beneficial changes to the heart, lungs and circulatory system. The healthier and more efficient the lungs and associated blood vessels, the easier it is for the individual to achieve even the minimum level of aerobic fitness.
Flexibility is how much range of movement an individual has in each of
the joints. Having appropriate flexibility enables you to perform everyday
activities safely and efficiently, e.g. touching your toes, reaching for the top
Skill-related Components: What They Mean
It's All Trainable - The components of fitness are very much like the components of a car. The
better the condition we keep them in and the more protection we give them, the
better their performance.
A balanced exercise programme aimed at improving all-round fitness should include each of the above health-related fitness components. A sports-oriented programme, where the aim is to improve a player's skill at that particular sport or group of sports, is more likely to focus on the skill-related factors.
However, the two categories can overlap. In an all-round fitness programme
certain skills are bound to improve as a by-product of the workout. For example,
the main focus of an aerobics class is cardiovascular conditioning, yet the
nature of the activity - involves a certain amount of agility and coordination.
Equally, a sports-oriented programme will also improve aspects of health-related
fitness as a result of the sports-type skill drills. The greatest improvements
however, will naturally occur in the aspects of sports that are focussed on most
We Are What We Do - The more fitness training we do, the more physical skills we will develop along the way and, equally, the more sports we play, the more we will hone our skills and increase our level of fitness. This is what the experts call specificity training, which means that people who, for example, do strength training will get stronger, people who run will improve their cardiovascular attributes etc. Specific adaptations are caused by specifically induced demands.
As we develop specific skills from frequently playing a specific sport or carrying out a specific activity, at the same time we will also develop specific fitness benefits. For example, body-builders who regularly lift heavy weights will become very good at lifting heavy weights because they will train their muscular strength, but they may not be able to run very far or for very long and therefore have poor cardiovascular fitness. Equally, marathon runners who are 'aerobically' fit as a result of regularly running long distances may not have much muscular strength and therefore not be able to lift a great weight. Furthermore, marathon runners won't necessarily be comfortable with short sprints, because their muscles will have trained to cope with running long distances.
On the positive side, our bodies generally respond well to exercise - indeed they thrive on it - and adapt to new challenges very quickly, which is why it is important when planning an exercise programme always to start at the level that is right for our ability and to progress at a suitable rate that keeps both our minds and our bodies interested.
While running a marathon or entering the next Olympics or even the local tennis
tournament may not be on your personal agenda, improving the quality of life and
making the daily grind less of a grind ought to be on everyone's list.
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We're not doctors, just people who have completed many, many years of research and study into health-related items, foods, their nutritional values and how they can affect all of us in different ways. We genuinely want to help as many people as possible and so the medical information on this website is solely for informational purposes. Please consult your doctor with respect to your own symptoms and conditions.
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