Objective of the study was to find factors of influence on the athletic strength building process and the relevant control mechanisms. The research methods applied included relevant psychological knowledge collection and systematization method; high nervous activity physiology and motor activity research methods; consciousness introspection method; and empirical data mining method. The muscle contraction strength was proved to be determined not only by the number and size of muscle fibers but also the quantity of the directly engaged muscle fibers that may widely vary depending on the situation. It was also found that individual willpower is the key factor in the muscle fibers mobilization process i.e. the degree of the volitional effect on the muscle group control centers. The motor center volitional controls and relevant responses, however, are naturally limited by the bodily physiological barrier i.e. the maximal achievable CNS excitation index, plus a variety of additional natural limitations including the following: imperfect motor skill level; low motivation; fatigue of the CNS; and emotional distractions.
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