The invention relates to an adjustable dumbbell and its use method. The dumbbell comprises a base and a dumbbell body, the dumbbell body comprises a handle and a bell piece, the handle is a combination of a central shaft and a handle sleeve, the handle is also connected with an indexing plate, a gear piece and a bell piece box, the ends on both sides of the central shaft are provided with a snap ring groove and a gear step from the outside to the inside, and the indexing plate is provided with a lock The bell box is connected with a bell box cover, the bell box cover is connected with a locking leaf spring and a steel ball spring, the locking leaf spring is connected with a locking leaf, and the steel ball spring is connected with a steel ball.

A sensing base for an adjustable free weight may include a cradle, and a sensing assembly, which includes a plurality of sensors and mechanical components (e.g., pivoting levers), each associated with a respective plate well that accommodates a weight plate of the adjustable free weight such that each mechanical component actuates the state of a respective sensor upon placement or removal of the weight in a plate well. Sensor signals reflecting the states of the sensors are communicated, via a circuit, a processor to determine the weight selection of the adjustable free weight when removed from the base. The sensing assembly may be implemented using individual sensors of a variety of different types such as hall effect sensors, optical interrupt sensors, IR optical sensors, and the like. The base may be configured to automatically communicate the determined weight to an external computing device to facilitate activity tracking and/or fitness coaching.

An adjustable dumbbell includes weight plates that are selectively connectable to a handle. Unselected weight plates are secured to a cradle. To secure the unselected weight plates to the cradle, a latch in the cradle is inserted into an engagement surface notch in the weight plate. The unselected weight plates are individually actuated based on which weight plates are selected and connected to the handle.

The abdominal exercise machine may comprise an upper armature, a lower armature, a central bar, and a plurality of weight discs. The abdominal exerciser may be adapted to be lifted by a user in order to perform one or more resistance training exercises. The upper armature may be adapted to be grasped by the user while the user lifts the abdominal exerciser. The plurality of weight discs may detachably couple to the central bar in order to establish the amount of resistance to lifting. The lower armature may elevate the plurality of weight discs and the upper armature. The vertical height of the plurality of weight discs and the upper armature be telescopically adjusted for the comfort and safety of the user. The abdominal exercise machine may be suspended from a pair of hooks of an equipment stand when not in use.

A hang row pendulum apparatus, comprising: a crossbar; and, a main post, connected to the crossbar at a lower end of the main post and having a pivot point on the main post opposite the crossbar.

The present disclosure relates to a dumbbell, which includes a first grip rod and two counterweight assemblies, each of both ends of the first grip rod defines a first screw hole, each of the two counterweight assemblies comprises at least one first counterweight, the first counterweight comprises a first connection portion, the first connection portion is threadedly received in the first screw hole to connect the first grip rod with the first counterweight. The present disclosure further provides a fitness equipment applying the dumbbell.

A barbell comprising a bar member, a first side weight assembly and a second side weight assembly. The bar member has a first side sleeve region and a second side sleeve region opposite the first side sleeve region. The first side weight assembly includes a weight surface and extends over the first side sleeve region, and is rotatively coupled to the bar member through an inner and outer slidable engagement surface. The second side weight assembly includes a weight surface and extends over the second side sleeve region, and is rotatively coupled to the bar member through an inner and outer slidable engagement surface. The bar member includes a first and second surface enhanced region, the first surface enhanced region spanning a portion of the central region and the first side sleeve region, and with the second surface enhanced region spanning a portion of the central region and the second side sleeve region.

The present example provides a barbell lock collar that installs axially on a barbell bar. Axially directed pressure on the barbell lock collar causes curved shoes on the interior of the barbell lock collar to engage or disengage through radial motion of the curved shoes. Axial motion also causes a visual indicator to show if the barbell lock collar is engaged or disengaged, as little force is required to operate the barbell lock collar.

An adjustable dumbbell comprising a bar assembly which can retain a user-selectable number of weight elements, user-selectable by actuation of sliding locking tabs. A base for supporting the bar assembly and weights while not in use is also disclosed. The bar assembly may possess notches into which the tabs of the weight plates may fit to retain weight plates in the lengthwise direction, and user-slideable tabs integral to the bar assembly which restrain selected plates to the notches by passing through the small notch and preventing transverse relative movement. With weight elements seated in the stand, and the bar assembly seated in an arrangement of weight plates, a user can select the number of weight plates connected to the bar assembly by extending or retracting the sliding lock tabs, and then lift the dumbbell from the stand carrying the desired number of plates, leaving the remaining plates in the stand.