Comment Re:Walking on sand (Score 2) 210
You know, we're engineers some of us? Let's "run the numbers"
Assume walking is about the same metabolic equivalent as riding a stationary bike lazily (http://en.wikipedia.org/wiki/Metabolic_equivalent), you expend about 50W more or less. So a 10W shoe is going to make it about 20% more "difficult".
Hard to say how that will "feel". "Walking on sand" seems to about sum it up.