Low Energy recipes require minimal physical effort, have lots of breaks, or can be made very easy with a few kitchen tools.
Medium Energy recipes require some physical effort that can't be replaced with a tool, like cubing or doing large cuts of meat or vegetables or stirring a stir fry.
Higher Energy recipes require even more physical effort that can't be replaced with a tool for longer periods of time. Like kneading dough for several minutes.
High Energy recipes are very demanding physically. I will have very few of these on the blog, but sometimes a special occasion calls for some special food.