In the early years up to 12 years of age of the boys are slightly stronger then the girls but during adolescence age when the biological and cultural influence the male more then the female to take part in activities,male become more stronger and active.The physical change brought out in the male are mostly due to testosterone hormone which increase bone size and muscles development.Muscles increase in size and strength.In advanced years the connective tissues are affected by exercise change is takes place in the connective tissues which become stuff decreasing the range of movement in the joints.The muscles fibers contract due to shortening of the contractile fibers,preventing their normal extension limiting their power,the changes in the connective tissues of muscles and ligaments and fascia,process the nerves and produce caches and pains in the old age.The inactivity and strained and postural abnormality causes pressure irritation of the nerve fibers producing Neuralgia.These conditions are relieved by gradual progressive stretching exercises which elongate the fascia and release the compression of the peripheral nerve.In advanced age bone decrease in density due to removal of various inorganic minerals from the bones like ca,phosphorus,mg which are mobilized from the bone and excreted.This process is called desorption or disuse degenerative astroporouses.The growth process in which the size and mass of the body increases it is completed up to 20 years of age.
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