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ability achievements analysis aspects athlete's athletes basic basis biological biomechanics Bulgaria capacity cardial cent changes characteristics coaches competition Congress contemporary contests correlation Coubertain countries culture and sport determined effective factors forms functional girls gymnastics human impact important improvement increase indices individual influence intensive international sports investigations kinds of sports labour leisure mass media maximum means ment methods Moscow motional motor activity muscles muscular Olympic Games Olympic Movement organism participation peace pedagogical performance period personality physical culture physical development physical education physical exercises physical fitness physical loads physical training possible practical problems programme psychological qualities revolution role scientific showed sical social socialist society Soviet Soviet Union specific sphere sports activity sports movement sports organisations sports psychology sports science sports training sportsmen stimulate structure task technological tests tion tNTIf/f USSR values women young athletes