Moderate-intensity physical activity, such as brisk walking, requires percent of one's aerobic capacity. 40-49 50-59 60-69 70-79

I am pretty sure that it is 50-59 percent

the maintenance of fluid balance during exercise. author information: fluid supplementation is necessary for exercise in which fluid losses must be offset by intake to avoid the negative effects of hypohydration on health and performance.

this is true my friend.