This September I swam more in a pool then in the ocean! Having a month-ticket to a nice neighboring pool makes it easier, and there was too much seaweed along the coast this year after the first hot weeks of Fall.
In the pool I used to make around 60 short lengths (25 yards) first, but then my friend pro-swimmer suggested I should do 66 (one mile, or 1650 yards, or 1.5 kilometres), and I switch to a swimmer's mile a day. I turn like I do in open waters, barely touching the walls and it takes me the whole 45 minutes of non-stop breaststroke to finish :) You may laugh about it, but for somebody whose main sport in youth was piano I am doing pretty nicely.
I am looking forward to double the distance if I have a chance to continue in this open air heated pool (~80F) for months, but I am not sure that staying in the chlorinated water for one and a half hours will be very pleasant, in the ocean it is no problem till 2-2.5 hours, but in the Pacific I get cold by the end.
A few days ago I bought a waterproof solar training watch with a timer and 120 laps counting by pressing a button, so now I don't need to keep numbers in my head and can go into a happy trance :)
Water is an essential nutrient - it is required in amounts that exceed the body's ability to produce it. All biochemical reactions occur in water. It fills the spaces in and between cells and helps form structures of large molecules such as protein and glycogen.
Most foods contain water. The body can usually get 20% of its total water requirements from solid foods alone. The human body can last weeks without food, but only days without water.
The digestion process also produces water as a byproduct and can provide around 10 per cent of the body’s water requirements.
Water is a transparent and nearly colorless chemical substance. Its chemical formula is H2O, meaning that its molecule contains one oxygen and two hydrogen atoms.
Water covers 71% of the Earth's surface. It is vital for all known forms of life. On Earth, 97% of the planet's crust water is found in seas and oceans, 1.7% in groundwater, 1.7% in glaciers and the ice caps. Only 2.5% of this water is freshwater, and 98.8% of that water is in ice (excepting ice in clouds) and groundwater. Less than 0.3% of all freshwater is in rivers, lakes.
Safe drinking water is essential to humans and other lifeforms even though it provides no calories or organic nutrients. ~One billion people still lack access to safe water. It was estimated that by 2025 more than half of the world population will be facing water-based vulnerability, and by 2030 water demand in some developing regions of the world will exceed supply by 50%.
Approximately 70% of the freshwater used by humans goes to agriculture.