Abstract: A fast adjustable dumbbell is provided, which includes a handle provided with a first accommodation cavity; a plurality of dumbbell pieces, two groups of dumbbell pieces are respectively provided at outer sides of two ends of the handle, and the dumbbell pieces are provided with first through holes; a rotatable shaft including two independent half shafts, which are provided in the first accommodation cavity, the two half shafts can move relative to the handle, and outer surfaces of the two half shafts are provided with symmetrical first threads; two transmission components respectively fixed at the two ends of the handle, and the transmission components are provided with second through holes corresponding to the first accommodation cavity. Hole walls of the second through holes are provided with second threads that are engaged with the half shafts; when the handle is rotated, the two transmission components are driven to rotate.

Abstract: A dumbbell with multiple gears of weight adjustment is provided, which includes a dumbbell body, dumbbell pieces provided at two ends of the dumbbell body, and two adjustment mechanisms respectively provided at the two ends of the dumbbell body. The dumbbell body includes a grip rod, a center rod, and two sets of shell components respectively provided on two sides of the grip rod. The center rod is rotatably provided at a center position of the grip rod; each shell component includes a main body shell and a plurality of connection discs. The main body shell is rotatably connected to the grip rod and fixed to the central rod. The connection disks are fixedly provided on the central rod and are distributed along a central length direction. The present application has the effect of improving a weight adjustment efficiency of the dumbbell.

Abstract: The present disclosure provides a simple dumbbell including a dumbbell rod, an adjustment component, and a dumbbell piece. Two semicircular telescopic rods are provided in the dumbbell rod, a square groove is provided in a middle of the two semicircular telescopic rods. A square rod is provided on the square groove, a fix hole is respectively provided at two ends of the square rod. A limit tooth is provided on the semicircular telescopic rod; the adjustment component includes an adjustment arm and a locking component. A connection hole is provided in a middle of the adjustment arm, a connection component connecting to an installation seat is provided in the connection hole. An adjustment area is provided below the adjustment arm, the adjustment area cooperates with the locking component to adjust the semicircular telescopic rod; the dumbbell piece is provided on an outer side of the adjustment component.