Swimming does burn calories at a rate of about 3 calories a mile per pound of bodyweight. If you weigh 150 lbs. and it takes you 30 minutes to swim one mile (1,760 yards or 1,609 meters), then you will be using about 900 calories in one hour.
Grape seed has antioxidant, antiallergenic, antihistamine, anti-inflammatory and immune boosting properties and it can be instrumental in helping the body fight viruses, allergens, and carcinogens. Because of its antioxidant properties, grape seed extract is considered an anti-aging wonder.
Grape seed extract can also cause other side effects, but these are less serious than increasing the level of blood pressure that is already high. These side effects include an itchy, dry scalp, headache; dizziness and nausea; hives; and indigestion.