Energy is an aspect of sport which is very difficult to quantify.
Some statisticians have tried to measure it to a certain extent with data on things such as “distance covered” but that doesn’t really do the trick. Players can keep moving perpetually for 90 minutes while adding very little energy to their side’s performance.
It’s quite a subjective attribute and relies not only on work rate or speed, but on attitude and intelligence as well. Energy is about more than chasing every ball, running like a roadrunner and never giving up. Energy also comes from sharpness and instinct. A player can provide bundles of energy without being the fastest player on the pitch if they make decisions on the ball which instantly put the opposition on the back foot.
