lonesinker wrote:A lot of people exercise by jogging,bicycling,hiking and swimming and doing weights to keep themselves fit. I wonder how many calories you can burn by wallowing thru a mudpit for an hour

just a thought. Your working out and enjoying yourself ...win win
I can answer this with some authority. Until my retirement, almost four years ago, my career job was as a professor of kinesiology. [Kinesiology" can mean several things but in this case it means exercise science.] Assuming the absence of pathology affect your heart, blood, or lungs, you can pretty well judge the intensity of any continuous exercise by your heart rate or by your breathing rate, and the specific exercise mode (running, swimming, etc) makes little difference with one exception I will address below. You can even do it according to what you can and cannot do at the same time, provided you are honest with yourself. If a mode of exercise, provided it is continuous, is intense enough that you cannot sing at the same time, but not so intense that you cannot talk at the same time, you will be using between 6 and 10 calories (food calories) per minute. An hour of that, then, computes to between 360 and 600 calories per hour. And lets be honest here, most peoplewill be toward the low end of that range. To carry this a bit further, one pound of body fat represents an energy reserve of 3500 calories, so to lose a pound of fat requires between 6 and 10 hours of exercise, assuming, of course, that you do not then have an extra beer or three afterwards.
Here is the exception I mentioned above. If the mud is cold then you will burn some extra calories replacing the body heat that is lost. Technically, however, most if not all of the replacement heat generation is going to come from muscular activity (probably shivering if things are extreme) and this will be reflected in the heart and breathing rates otherwise associated with the actual exercise as that takes place, so the only real increase in caloric expenditure will occur after the exercise is completed and while you are getting warmed up again. In any case this expenditure of calories is going to be quite limited unless the cold exposure is such as to be rather dangerous.
Ten hours of exercise to lose one pound of fat SOUNDS like quite a lot. No one is likely to sepnd ten hours exercising neck deep in a mud pit any more than they are likely to swim or walk continuously for the same time. However, the ten hours of exercise does not have to be continuous. The exercise during each "bout" of exercise does need to be continuous for these calculations to have any usefulness, but a bout could be, say, fifteen minutes. That is to say, one 10 hour bout will burn the same number of calories as 40 fifteen-minute bouts, assuming the itensity if the same. Therefore, if you did fifteen minutes every day for a year, except for five days off to keep the arithmetic simple, and if you did not alter what you eat, you wuold burn up the equivalent of 9 pounds of body fat during that year.
Now, for those of you still awake, be advised there might be a quiz next time.