The research aims at the analysis of the effects resulted from the exercise practice and the suspension of the practice. The infants were given the following seven types of exercises to do once a day: (1) standing on one leg (2) repeated sidesteps (3) standing broad jump (4)running broad jump (5) bending forward (6) repeated jumping on one leg and (7) back muscle. The results were comparatively studied as they were drawn (1) before the infants started practice (2) a month after they started (3) two months after they started (4) before the summer holidays and (5) after the holidays. We have reached the conclusion that remarkable effects of practice in exercises have been observed in respect of the types of exercises that required "skillfulness" and "promptness" but no remarkable effects have been observed in respect of the once that require muscular labor.