The slower Work occurs the lower the amount of Power needed. The unit of measure HUP stands for human power, as contrasted cleverly to horsepower. 1 hup equals the power an average human can sustain for 8 hours before collapsing into sweaty pile of fatigue. Roughly 1 hup represents the same power as 0.1 hp or in common metric units 75 watts. Obviously there are other mysterious forces of the universe clutching at every workbiker, desparately trying to toss us into the dark pit of entropy.
Gravity is weighty subject.
While climbing hills we ponder it's existance the same way we might regard a mosquito buzzing in one ear. As with most things in life, vile bains or devine gifts exist by virtue of our own free will, the result of choice and attitude. On a smooth level stretch of road, gravity's effect while pulling the pigs to market has been defined solely by rolling resistance. When pointing ourselves and Porky and friends towards the sky the towing force will increase in direct relationship to the slope of any hill we encounter. When pointed downhill, the squealing lard and meat will be pushing with a 15 lb force.