The antifatigue and endurance promoting properties of two Korean medicinal herb extracts and molasses with various mineral components were studied by evaluating forced-swimming capacity and biochemical parameters in ICR mice. The treatment groups were orally administered mineral beverages which were contained 6% sugar with the mixture of Maesil (Prunus mume fruit) extracts, Omija (Schisandra chinensis fruit) extracts and molasses for 4 weeks. The exercised forced-swimming tests were conducted after 28 days of beverage supplementation. The swimming times to exhaustion were longer 1.5${sim}$2 times in group 6 and group 10 than control goup (Control: 93.2${pm}$10.4 sec; Beverage 6; 190.8${pm}$25.6 sec, Beverage 10; 173.6${pm}$21.8 sec; p<0.05). Moreover, the activity of hexokinase (Control: 5.23${pm}$0.38 ${mu}mol$l/g tissue; Beverage 6: 5.99${pm}$0.18 ${mu}mol$/g tissue, Beverage 10: 6.13${pm}$0.25 ${mu}mol$/g tissue, p<0.05) and citrate synthase (control: 42.9${pm}$1.87 ${mu}mol$/g tissue; Beverage 6: 56.8${pm}$3.98 ${mu}mol$/g tissue, Beverage 10; 59.5${pm}$3.09 ${mu}mol$/g tissue, p<0.05) were also significantly higher than those of control group. Even if the treatment groups had long swimming than control group, there is no significant difference in the glycogen contents of gastrocnemus muscle or liver between the control group and each treatment group. This demonstrated an improvement in endurance. These results suggest that reported herbal beverage is very effective to combat fatigue, improve endurance and increase overall physical activity.