I'm not even sure what to think of this as I learned in middle school (many, many moons ago) that speed walking was the most efficient way to walk, and I've been doing it since. I have a hard time walking at a moderate pace, much less slowly.

I can sing songs (and do) walking at this pace even when my daughter (40 lbs) is on my shoulders when I've walked her to school for a mile or so.

Walking at a more deliberate and slow pace would no doubt be helpful.

I read in the first link to lock the knee. I didn't quite understand this explanation.

Now that I'm 41 and haven't been very active much lately I could use all the help I can get no doubt, especially when I'm carrying the bulk of the weight.