2, temperature difference: not only keep warm, but also cool down, which can play a powerful role. Cover your body from the sun.
3. Moisture: Not only contact with water, but also moisture or sweat in the air can play a role.
4. Pressure: Add gravity, water pressure, air pressure and other pressures, as long as you can feel the pressure of your body.
5. Friction: Vibration or friction will lead to a strong friction effect. Tourmaline and its creatures come into contact with the body, touching the water, body temperature and pressure of the body. By moving the body, friction and convection can be generated. Therefore, tourmaline works best when it comes into contact with human body.