It's interesting how the motivation involved behind a task changes the perspective. Very few of us would find the labor behind filling bags with dirt appealing. It's hard, dirty, back breaking labor. But if the cause was defined as using those bags to build a dike to keep a town from flooding, the work would take on a whole new appeal. Perhaps it's more the vision of what your laboring for that defines the tedium of the chore?
The assignment of purpose makes the medicine go down. We'd be hard pressed to find people to voluntarily become the operator of a shovel; it's simply work that most people find beneath them. Redefine the purpose to saving someone who's buried in a hole and those shovel operators are many and dedicated. We are creatures that seek significance. We need purpose to fulfill an assignment with vim and vigor. This is why it's so important as a leader to be able to paint the vision of purpose. Purpose drives people! Lack of purpose ignites a mediocre effort at best. Results are defined by the vision of the reward, and the reward has to invoke a sense of significance. Define the why!