Acidic and alkaline water, pH all water and all aqueous solutions contain both H+ and OHâ ions. If the quantity of H+ exceeds that of the OH-, the water is said to be acidic. If there are more OH-ions than H+, the water is alkaline. Pure water, which contains equal numbers of both ions, is said to be neutral. Chemists express the degree of acidity or alkalinity on the pH scale which runs from about 0 to 14. Acidic solutions have pH values of less than 7, alkaline solutions more than 7.
Examples of aerobic exercises include marathon running, long-distance cycling and walking. Even meditative exercises, such as yoga and tai chi, can be called aerobic because aerobic respiration is still the dominant energy system your body uses, even if the intensity is much lower than running.
Examples of anaerobic exercise include weight lifting, sprinting, and jumping; any exercise that consists of short exertion, high-intensity movement, is an anaerobic exercise. Anaerobic exercise is typically used by athletes in non-endurance sports to build power and by body builders to build muscle mass.