Agreed, it was not so much en passant as much as I did not want to elaborate a comment into an essay ;) Also agreed, running heel first feels like a terrible i

Agreed, it was not so much en passant as much as I did not want to elaborate a comment into an essay ;) Also agreed, running heel first feels like a terrible idea (and that's a skateboarder talking here, so I know my share about impact ;) Indeed at the very least a lot of downward energy is lost, uncaptured by Achille tendons: it really seems like a lot of waste to turn yourself from a digitigrade to a plantigrade, foregoing a whole joint and lever in the whole of that whip-like system.