In the world now, the main cause of death is cardiovascular problems.
This means that our vascular systems are not working correctly. The result is that the heart works too hard.
The vascular system does not work correctly when vessels are constrained by the muscles. This is what happens when energy is not expended correctly.
Therefore one of the best methods of balancing our energy is to have a definite aim.
This is accompanied by a definite time, followed by rest and detachment.