Increased body resistance

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Occasionally I had the problem not all that him body resistance. For example, in fact the temperature of the ac in the room was not too really cold, but I liked shaked. It was other that the example, swam also, occasionally liked shaked. By that, if jogging liked fast tired. In fact i has do true heating & sport was in stages. Why is it that how come rich gitu? Please his help. Thank you