One of the lessons I remember from high school physics is that it takes less energy to pull an object than to push it. The force which resists is friction. This is also true for human psychology and friction might be a good word for it although the friction occurs in the head. If we dread or avoid a task or an event, more energy is expended than if we look forward to it. The amount of energy to perform the task is the same. The amount of energy used up usually expands when we avoid due to the longer time it takes to get started. Looking forward could be considered to be energy in motion which relates to another law of physics that once an object is in motion, energy consumption is less than stopping and starting. Being in motion is a natural human condition and it results in a sense of well being whether it is physical or psychological. [Russell]