Primary stimulus for muscular mass enlargement is to repeat developing of sceletal muscles force in the level above the one which exist in everyday activities. The aim of this work was following the growth of lower leg extensor muscular force as well as changes in the surface of a diagonal upper leg muscular tissue cross-section during eight-week programming force training. 12 male subjects, who were neither active nor regular in practicing sport for the last six months, were included in this examination. Conducted training programme was based on dynamic lower leg extensor muscular force training with concentric and eccentric component. Programme was consisted of three training a week for the period of eight weeks. Anthropometric measuring of the upper leg as well as upper leg skin folds ranges were conducted before the th beginning of training programme, after 4 week and at the end of training programme, and also calculated the surface size of diagonal upper leg pure muscular mass cross-section. During eight-week training, we have statistically significant growth th th of lower leg extensor muscular force (27.20% in 4 week, 50.18% in 8 week). After four-week training, we have statistically enlargement in the surface of diagonal left and right upper leg muscular tissue cross-section for 2.62% and 2.45%. This dimension continued to grow by 8th week of training (7.63% and 7.07%). Programming force training with concentric and eccentric component has lead to significant muscular force growth as well as surface enlargement of diagonal upper leg muscular tissue cross-section in previously untrained person. Muscular mass enlargement was more th th important at the end of 8 week than after 4 week

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