A dumbbell assembly includes a tube 1, a rod 2 rotatably received in the tube, and two rotary units 3 respectively connected to two ends of the rod. Each rotary unit has a wing 32 to which multiple weight members 4 are connected. The rod is rotated relative to the tube and the wings together with the weight members are rotated to generate centrifugal forces. Preferably the assembly includes connection ends 11, reception members 12, tubular portions 13 having spaces 14 which house bearings 15.
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