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.
The three main types of exercise are aerobic, anaerobic and flexibility. Aerobic exercise is exercise which requires the use of oxygen to fuel the body for exercise demands. This form of exercise is traditionally thought of as cardiovascular exercise, such as running on a treadmill or cycling. Anaerobic exercise is a form of exercise that requires glucose for short intense workloads.