The search aims to: Identifying the effect of functional strength on some body minerals (sodium - potassium) - and the pH in the blood and their effect on improving specific physical abilities and the digital level of belly crawl swimming is under investigation. The researcher used the experimental method. The research sample was selected intentionally from junior short-distance swimmers over 15 years old at Al-Sharqiya Sports Club during the season.../.... The total number of members of the research sample reached (16) swimmers, and the researcher selected the number ( 6) Swimmers randomly selected for the exploratory study from the research community and outside the basic research sample. Thus, the basic research sample became (10) swimmers for the 50-meter belly crawl swimming race.