Burns calories. Swimming burns lots of calories, anywhere from 500-650 per hour depending on how efficiently you swim (you burn more flopping around than swimming cleanly!) and how buoyant you are (the more body fat you have, the more you float and the fewer calories it takes to swim).
Large amounts of vitamins and minerals are found in green barley (Barley Greens) leaves. These include potassium, calcium, magnesium, iron, copper, phosphorus, manganese, zinc, beta carotene, B1, B2, B6, C, folic acid, and pantothenic acid.
The effect may also be less when barley is highly processed. Barley may also lower blood pressure in people who do not have high blood pressure but do have high cholesterol. Fiber in foods, such as in barley, may help prevent stomach cancer or prolong life in those with the disease. But it doesn't seem to protect against colorectal cancer.