Abstract: A precessional foot exercising device utilizing a housing containing a spinning mass which forms the rotor of a motor for spinning the mass. The spin axis of the mass is perpendicular to upper and lower surfaces of the housing. A foot plate receives the foot to be exercised. The foot plate is mounted for rotation about two mutually orthogonal axes to provide two degrees of rotational freedom of the foot. The housing is coupled to the foot plate so that the upper and lower surfaces of the housing and therefore the spin axis are rotated by rotation of the foot plate caused by rotation of the foot detachably secured thereto. Rotational movement of the foot is opposed by the gyroscopic effect of the spinning mass, producing an isometric exercise effect when the foot plate is rotated by muscles of the foot while the precessional torque of the spinning mass is opposed by other muscles of the foot.