If you're looking for information on a walk, you'll need to look in the Exercise section. This will tell you duration, calories burned, average heart rate, steps taken, and active minuts just for that exercise.
Not all exercises produce active minutes and not all active minutes are recorded as an exercise so there needs to be a distinction on our end as well. For instance, my recent two hour long "sport" exercise only accounted for 58 of my 80 active minutes. The other 22 were acheived by doing some strenuous work at the house but did not register as an activity. If you were to combine active minutes and exercises then I would have incorrect information.
