Do you practice yoga and/or swim laps to keep in shape? Ever wondered which one burns more calories?

According to a recent post on iVillage.com, swimming burns about 60 percent more calories than yoga. Active yoga burns 166 calories/hour while swimming burns 270 calories/hour. The reason is due to water's resistence, which can be up to 10 times more resistant than air.

To get the most out of your workout while swimming laps, iVillage suggests alternating between the backstroke and the breast stroke, which burn more calories than other swim strokes.