Abstract: In some embodiments, a balance board comprises a base plate for positioning the balance board on a surface, a platform coupled to the base plate via one or more adjustable couplings configured to allow changing a stability of the platform. In the balance board, the platform is configured to undergo a tilt in response to a torque applied to the platform; increase a magnitude of the tilt by a tilt increase in response to an increase in a magnitude of the torque by a torque increase; and upon decreasing the stability of the platform, increase a magnitude of the tilt increase in response to the same torque increase.