We are not talking here about counting caloris like many people do with the aim of losing weight. Instead we are discussing a way to see your total workoug. For those who do just one sport tracking your level of exercise is much simpler and is often done with something like  miles per week, or yards swimming.  Of course this simple measurement doesn't take into account things like speed but it is sufficient for most people.   When you have multiple sports, such as the triathlete, tracking your progress is much more difficult because a mile swim is a lot more than a mile running and much more than a mile cycling.

One method is to equate different forms for exercise with the number of calories burned. Here are calorie calculators for cycing, running and swimming. Try to put your weight in each and pick one hour for the time, and your the best pace you can do for an hour. How many calories do you burn for each type of exercise? Are the results the same for both running and cylcing?