The practice of standing on a Sadhu board, a board embedded with nails, has gained attention as a physical exercise. Practitioners often report an initial hesitation, perceiving the practice as painful or impossible, before finding the experience beneficial after several weeks of consistent use.
The physical mechanism behind the practice relies on the density of the nails. When nails are positioned closely together, the body weight of the user is distributed across hundreds of points. This distribution significantly reduces the pressure exerted on any single point of the foot, making the experience manageable for the user.
Experts in the practice emphasize that the key parameter for beginners is the spacing between the nails, known as the step. Proper selection of this spacing is essential for those looking to begin the practice safely without causing injury to the feet.