For the first time in my life I attempted pulling a car. Quite possible and easy in the beginning, but aftereffects are terrible! Comparable to running a timed 3.5 km race.
My legs were pretty tired, like after squats with a barbell, I was out of my breath for a long time, like 20 minutes, my throat was burning for an hour.
This is really a good way to train stamina and power.