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.
1 It has been used safely for up to 8 weeks in clinical trials. 2  Side effects that have been reported include a dry, itchy scalp; dizziness; headache; high blood pressure; hives; indigestion; and nausea. 3  Interactions between grape seed extract and medicines or other supplements have not been carefully studied.