Are there some quick ways (other that simply running a lot) to learn to spend less energy per minute, given same speed? E.g. trying to hold upper body on same level, or something along these lines?
Donovan and TBR are correct to a point, but unfortunately, if you've got bad bone length-ratios (eg, very long toes and a long foot) and alignment problems, you're always going to be inefficient.
Those factors -- length ratios, alignment, and a lightweight calf, among others are what set the elites apart from the rest of us (in efficiency).
