The Knee-bone's Connected to the Leg-bone

And getting those leg bones in motion means a lot. Did you know that adults gain two hours of life expectancy for each hour of regular exercise. (American Heart Association)

Or that—taking the stairs for a total of 2 minutes, five days a week gives you the same calorie-burning results as a 20 minute walk. It burns 100 to 140 calories.

As for the knee bone: Researchers reporting in the journal Arthritis & Rheumatism found that for every pound of weight lost there is a four-pound reduction in the load placed on the knee joint with each step. The accumulated reduction in knee load for a one-pound loss in weight would be more than 4,800 pounds per mile walked. Lose 10 pounds and your knees would be subjected to 48,000 less pounds of pressure per mile.

Less weight, less pressure, less knee pain.