A method of exercise includes partially filling (not more than 70% full) a symmetrical hollow body of an exercise device with water, grasping a pair of opposed handles attached to the hollow body, positioning the device at a height and orientation for a first set of motions, and rapidly oscillating the device at a frequency (≥2 HZ) to transform the water from a static state into a dynamic state in which the center of mass oscillates and hydrodynamic forces arise. Optionally, an additive such as viscosity enhancer or beads for audible effect may be introduced in the water.

An exercising device for fitness training includes a main body forming a container, and a first end and a second end. The main body defines a length between the first end and the second end. The container has an outer surface, an inner surface, and a substantially hollow cylindrical shape with a cross-section which varies between the first end and the second end such that the outer surface and the inner surface define a waveform. A first cover is detachably arranged on the first end and a second cover is detachably arranged on the second end. The container can be filled with a liquid which causes the exercising device to vibrate when it flows through the main body at varying speeds. In addition, a method for operating the exercising device is provided.

A dumbbell has a grip rod and multiple counterweight blocks. The grip rod has two connection segments each having multiple baffles to define multiple connection recesses between the baffles. The counterweight blocks are engaged respectively with the connection recesses. Each counterweight block has a body and a buckle. The body has an engaging channel extending from a center to an edge of the body and being expandable. The engaging channel has an opening and two protrusions to form an engaging space for being mounted around one of the connection segments. The buckle has a first end and a second end. The first end is connected pivotally to the body and at a position on one of two sides of the engaging channel. The second end is connected detachably with the body at a position on the other one of the two sides of the engaging channel.

A sand training bag for sand and/or mineral training in an open and closed configuration. The sand pit training bags includes a sand pit training bag configuration comprising at least one fastener and at least one overlaying fabric around the perimeter to open flat on a surface. The sand training bag includes attachable wall structure, wherein the surface attachable wall structure is configured with a sand pit training bag in an open configuration visible relative to a sand or mineral pit held by one or more fasteners. The sand training bag includes a single sand pit training bag, wherein the single sand pit training bag is convertible to a single sand pit with at least one attachable perimeter wall around the perimeter of the open sand or mineral receiving surface configuration, wherein a top cover is configured to be viewed as a sand or mineral pit closed configuration. In one embodiment, the number of sand training bags with at least one attachable perimeter removably attached to another sand training bag is unlimited.

Exercise devices and methods avoid the establishment and transmission of any abrupt impact to a person during the conduct of an exercise routine with an exercise device having an elongate tubular body of flexible material with an internal chamber extending longitudinally between opposite terminal ends of the chamber, and a liquid medium partially filling the chamber so as to be movable between the terminal ends in response to manipulation of the tubular body. The chamber is provided with a reentrant curved contour configuration at each terminal end such that during manipulation of the tubular body while conducting the exercise routine, the liquid medium, upon reaching a terminal end of the chamber, will follow a smooth, uninterrupted return path along the reentrant curved contour configuration, thereby creating an exercise force while avoiding the establishment and transmission of any abrupt impact at a corresponding terminal end. A transparent portion of the tubular body reveals instructive or entertaining images displayed within the tubular body during the conduct of an exercise routine.

A resistance training glove device having a glove casing for attachment to an individual's hand. The glove casing includes a first member and a second member. The first and second members are attachably connected to one another to collectively form the glove casing. The first member has a body element which includes an enclosed tank for receiving and storing fluid. The second member includes a handle bar element, a cuff element and a reception cavity. The reception cavity receives the individual's hand when the glove casing is attached to the individual's hand. The stored fluid in the glove casing provides a weighted resistance to the individual during movement of the attached glove casing.

A pronation supination wrist deviator exercise device includes a handle having a proximal portion and a distal portion; a shaft defining a longitudinal axis extending from a proximal end to a distal end; and a head portion having a predetermined weight. The head portion or the handle are mounted for relative movement on the shaft between a first position and a second position. The head portion and the handle define a first distance. The predetermined weight of the head portion represents a first weight. The first weight multiplied by the first distance represents a first effective torque of the device. When the distance between the head portion and the distal portion of the handle is changed to at least a second distance, the first weight multiplied by the second distance represents at least a second effective torque of the device.

A fitness device for strength training can include: a clamshell housing including a front portion and a back portion. The front portion and the back portion can mate together to define an internal volume. The clamshell housing includes first handle portions extending circumferentially around the front portion and second handle portions extending circumferentially around the back portion. The first and second handle portions mate together to define a plurality of handles. The fitness device includes a sealed container defining a fluid chamber. The sealed container can be fixedly received within the internal volume defined by the front portion and the back portion of the clamshell housing. The fluid chamber of the sealed container can contain: a gaseous component, a first fluid component, and a second fluid component.

A adjustable workout sled bag in a closed configuration is to be used as a workout bag by one or more grips, fasteners, loops, woven tape and/or reinforcement positioned on the outer periphery of the adjustable workout sled bag. The adjustable workout sled bag with at least one dense surface to be used as a dragging tool with a harness, straps and other accessories to train for speed and VO2 a harness to be used as a separate tool, for speed and agility, strength, endurance, conditioning and to correct posture by uplifting the torso. The adjustable workout sled bag can be used as a backpack with a strap for resistance exercises or without harness. The adjustable workout sled bag comprising of at least one fastener to transition to an open configuration which includes at least one compartment, configured for enclosing one or more fillers and other objects is disclosed.

A sand training bag for sand and/or mineral training in an open and closed configuration. The sand pit training bags includes a sand pit training bag configuration comprising at least one fastener and at least one overlaying fabric around the perimeter to open flat on a surface. The sand training bag includes attachable wall structure, wherein the surface attachable wall structure is configured with a sand pit training bag in an open configuration visible relative to a sand or mineral pit held by one or more fasteners. The sand training bag includes a single sand pit training bag, wherein the single sand pit training bag is convertible to a single sand pit with at least one attachable perimeter wall around the perimeter of the open sand or mineral receiving surface configuration, wherein a top cover is configured to be viewed as a sand or mineral pit closed configuration. In one embodiment, the number of sand training bags with at least one attachable perimeter removably attached to another sand training bag is unlimited.