Using a Sadhu board can seem intimidating and even dangerous to some people, but when used properly and with caution, it is generally considered safe. The spikes or nails on the board may look intimidating, but they are designed to apply gentle pressure on the body without causing any serious harm.
However, as with any new physical activity or exercise, there are certain risks involved. Individuals with certain medical conditions, such as high blood pressure, diabetes, neuropathy, or other circulatory disorders should consult their doctor before using a Sadhu board. It is also not recommended for pregnant women or individuals with open wounds or skin conditions.
It is important to start slowly and gradually build up to longer sessions on the board, especially for beginners. It is recommended to start with shorter periods of time, such as 1-2 minutes, and gradually increase the duration as the body adjusts to the sensation. It is also important to use proper posture and alignment on the board to avoid straining the back or joints.