Nick Maclaren wrote:

Moving a mass of a pound the distance of a foot isn't a measure
of energy. At a naive guess, it would mean a foot-pound(force),
a.k.a. a foot-poundall, or a foot-pound(weight). But another,
equally important, question is how it is specified to be measured
(which is where my remark about BHP comes in).

What's the difficulty with BHP? Almost self-explanatory.