Every human has 100% of his energy to start the day with. It depends upon us where we use that energy/ attention.
We use some of the energy during communication, work, socializing, exercise, eating etc.
While standing on the nails. 100% of your attention will be on yourself. The nail practice is unique and helps with focus. You come in the present moment.
The "advanced" level of boards is much more powerful in bringing back your energy levels to the here and now. They remove the clamps in your body to help the flow of energy.