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The rate at which we develop and grow is variable. Boys and girls of the same age show big differences in growth spurts especially when puberty is reached. At the age of 12, girls are much taller than boys of the same age, but at 16 years of age, boys shoot up and overtake the girls in height and body strength.

The way the body develops is not just a result of physical changes, as our mental processes have a large part to play in what we want to achieve. A desire to become a skilful footballer, a long distance runner or a strong swimmer require stamina and years of practise to try and attain the top level.

The food we eat will, to a certain extent, determine how we grow and gives us strong bones. A lack of activity and eating too much sweet sugary food can result in people gaining excessive amounts of weight. It seems unfair that one person can eat all sorts of fattening food and not put on weight whilst others just 'looking at a cream cake' can put on pounds or kilos.