Within this research, the effects of daily utilization of adequate quantity of re-hydration drink-apple and celery cocktail-on the endurance of welltrained athletes are determined. This drink contains up to 10% of carbohydrates (8.83%). The level of Ca is 130.52 mg/l, K-425.17 mg/l; Mg-25.15 mg/l; Na-48.16 mg/l and P-69.44 mg/l. In its energetic structure (quickly absorbable sugar up to 10%) as well as for its good contingency of potassium, this drink corresponds to the needs of the researched group of athletes; pH value of this drink is 2.93.