Multi-functional fitness device

A multi-functional fitness device, comprising a first supporting seat, a second supporting seat and a sphere, wherein the first supporting seat and the second supporting seat are respectively provided with a first concave spherical surface and a second concave spherical surface matched with an outline of the sphere, the first supporting seat and the second supporting seat are oppositely arranged, the sphere is supported between the first supporting seat and the second supporting seat, two sides of the sphere are partially fitted and embedded into the first concave spherical surface and the second concave spherical surface respectively, at least one of the first supporting seat or the second supporting seat is configured to be movably connected to a surface of the sphere through the corresponding first concave spherical surface or the corresponding second concave spherical surface, and adhered to the surface of the sphere to move with a center of the sphere as a movement center, and an elastic member configured to generate an elastic contraction force is connected between at least one pair of opposite side edges of the first supporting seat and the second supporting seat.