Not the kind of water jogging where you jog in deep water, just jogging across a pool in chest deep water?
How does jogging in water compare to jogging on land, for fitness?
March 28th, 2010 
My Health 
March 28th, 2010 My Health 
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jogging in water is WAY harder, meaning if you can last as long it is better. Also, it is easier on your joints.
Water is 800 times denser (thicker) than air. Because of this, it takes more energy to move through it. If you were to jog through it while trying to keep the same pace as you would on land, you would get tired faster. You also would not be able to cover the same distance in the same amount of time in water versus land.
As a scuba diver, and instructor (for http://www.visibilityunlimited.com) ,we are taught to streamline ourselves and our equipment to reduce the drag caused by the water. Which is the opposite for someone who is working out in water.
People using water for fitness use things like webbed gloves
http://www.love2splash.com/category/702775321/1/Fitness-Accessories.htm
and fins
http://www.love2splash.com/category/702771681/1/Swim-Fitness.htm
to increase drag.