 Even though an improved weather, but the gradient near the Hsichih stop of Hsichih-Wugu Elevated Viaduct made a major challenge on runners' physical strength.
<clarity>  Even though an improved weather, but the gradient near the Hsichih stop of Hsichih-Wugu Elevated Viaduct made a major challenge on runners' physical strength.
 Even though an improved weather, but the gradient near the Hsichih stop of Hsichih-Wugu Elevated Viaduct provided a major challenge on runners' physical strength.