By walking barefoot on the ground, the body absorbs energy, too. There are powerfull energies on earth that could be used by mankind.
You can observe that extremely well by watching children. They like to walk and run in the open and they are full of energy. The older they get the more get they used the “rules” of mankind. They wear shoes and do not move anymore as fast and full of energy as they did.
The best is probably to walk barefoot along the beach.
If there is a garden or a park near your house/flat, just walk barefoot there and absorb precious energy from the earth.
The flow of energy to the earth is partly highly interrupted by wearing shoes, especially by wearing high heel shoes (mainly women).