A weight system may include a concentric weight plate, a weight body, a locking mechanism, and a handle. The weight body may define a cavity. The locking mechanism may be disposed within the cavity. The locking mechanism may be configured to selectively attach the concentric weight plate to the weight body. The handle may be coupled to the weight body and configured to permit a user to move the weight system as a single unit.

A weight system may include a concentric weight plate, a weight body, a locking mechanism, and a handle. The weight body may define a cavity. The locking mechanism may be disposed within the cavity. The locking mechanism may be configured to selectively attach the concentric weight plate to the weight body. The handle may be coupled to the weight body and configured to permit a user to move the weight system as a single unit.

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.

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.

A dumbbell apparatus which is adapted with a series of weight plates, the number of which can be safely and reliably adjusted with a single simple motion. The apparatus comprises a cradle for storing and deploying the apparatus, weight plates, and a handle apparatus which has two spline bolts which support the weight plates and are used to simultaneously be adjusted by means of an adjusting pin which moves the spline members together through a motion transmitting gear. The apparatus may be further enhance with permanent weights and gripping options.

A dumbbell apparatus which is adapted with a series of weight plates, the number of which can be safely and reliably adjusted with a single simple motion. The apparatus comprises a cradle for storing and deploying the apparatus, weight plates, and a handle apparatus which has two spline bolts which support the weight plates and are used to simultaneously be adjusted by means of an adjusting pin which moves the spline members together through a motion transmitting gear. The apparatus may be further enhance with permanent weights and gripping options.

A dumbbell may include a handle, a first weighted portion and a second weighted portion, wherein the first weighted portion has a first cap and a first receiving space to receive one or more weighted units therein, and the second weighted portion has a second cap and a second receiving space to receive one or more weighted units therein. In one embodiment, the handle has a first threaded portion and a second threaded portion located at two opposite ends of the handle, and the first threaded portion is configured to threadedly engage with a first cap to secure the weighted units in the first receiving space, while the second threaded portion is configured is configured to threadedly engage with the second cap to secure the weighted units in the second receiving space.

A dumbbell may include a handle, a first weighted portion and a second weighted portion, wherein the first weighted portion has a first cap and a first receiving space to receive one or more weighted units therein, and the second weighted portion has a second cap and a second receiving space to receive one or more weighted units therein. In one embodiment, the handle has a first threaded portion and a second threaded portion located at two opposite ends of the handle, and the first threaded portion is configured to threadedly engage with a first cap to secure the weighted units in the first receiving space, while the second threaded portion is configured is configured to threadedly engage with the second cap to secure the weighted units in the second receiving space.

An exercise ball with internal weight with two shell portions, at least one internal plate weight, and at least one strap with engaged with the plate. The shell portions have at least one internal plate relief, and at least one external relief formed on an outer surface of the shell to allow access to an inside of the shells. The plate has at least one alignment aperture for retaining the plate in the internal plate relief of the shell portions, and at least one connection area comprising a slot on the plate to allow the attachment to slide therethrough to retain the plate in the relief of the shell portions. The strap extends outside of the shells through the at least one external relief when the two shells are connected together around the plate.

A modular weight training bag system, made up of a main bag constructed of heavy pliable fabric with a zipper-less closure, an inner lining that holds a granular material which adds weight and volume to the main bag, and also has a uniquely designed closure, using various size pouches to increase weight, an add-on weight attachments installed on the main bag for the purpose of quickly increasing the weight of the bag, a capsule sleeve for securing two main bags together, and a soft shell constructed to cover the main bag or capsule sleeve.