Is rededication to exercise one of your New Year's resolutions? Are you thinking about what to do for cardio and calorie burning? If so, the following might interest you.
In another blog, a discussion of running versus walking came up. One commenter said that walking and running burn the same amount of calories per hour. I offered that they don't burn the same amount per unit of time, they burn the same amount of calories per unit of distance. Basic physics. Moving a specified mass over a specified distance requires the same amount of energy regardless of speed. And since runners generally cover more ground per unit of time than walkers, they usually burn more calories per unit of time.
The commenter responded that my observation is "predicated on the assumption" that runners move faster than walkers and the commenter insisted that they generally don't.
I'm sure some walkers walk faster than some runners; I was speaking generally. I think they move faster on average, but I never studied the question.