a foldable backrest, including a backrest plate, operatively configured to be leaned upon by a back of a user. A support plate pivotally connected to the backrest plate operatively configured to be placed on a surface on which a user desires to sit or lay down on. One or more movable rigid wedges configured to form a desired angle between the backrest plate and the support plate in respect to the pivot connection between the backrest plate and the support plate. One or more wedge-stopping means for fixing the movable rigid wedge in a position for forming the desired angle. The one or more movable rigid wedge(s) configured to transfer mechanical support to the backrest plate from a surface on which support plate is positioned when the rigid wedge is fixed in a desired position by the wedge-stopping means.

Disclosed are devices for attaching a seat to a stand-up paddleboard. The devices generally have an open “C”-shape that is designed and configured to accommodate the side rail of a stand-up paddleboard while maintaining flush contact with at least a portion of the bottom of the stand-up paddleboard. The present disclosure also relates to a system for attaching a seat to a stand-up paddleboard. The system includes the above-described device and a mechanism for connecting the device to a seat disposed on the stand-up paddleboard. The mechanism for connecting the device to a seat can be, for example, a strap or a hook. The connecting device can be varied to accommodate the location on the seat to which the connecting device is attached.

Disclosed are devices for attaching a seat to a stand-up paddleboard. The devices generally have an open “C”-shape that is designed and configured to accommodate the side rail of a stand-up paddleboard while maintaining flush contact with at least a portion of the bottom of the stand-up paddleboard. The present disclosure also relates to a system for attaching a seat to a stand-up paddleboard. The system includes the above-described device and a mechanism for connecting the device to a seat disposed on the stand-up paddleboard. The mechanism for connecting the device to a seat can be, for example, a strap or a hook. The connecting device can be varied to accommodate the location on the seat to which the connecting device is attached.

Disclosed is an electric surfboard that can determine whether or not a user is on board while the surfboard is working, and if not, can stop operation of the surfboard, and that can naturally cool heat generated from a control unit and a motor unit. The electric surfboard includes a surfboard housing, foot bindings which are put on a user, a step-out detecting unit for creating a magnetic field and attracted to the housing by a magnetic force, as well as being physically coupled to an ankle strap, in which if the user steps out of the surfboard, the step-out detecting unit being detached from the housing, thereby detecting step-out of the user, and a control unit receiving a step-out detecting signal outputted from the step-out detecting unit to send a signal for stopping operation of the surfboard.

A surfboard is disclosed herewith comprising an external housing and attachment means. The attachment means may comprise any known attachment technique such as receptacle means, adhesive means, suction means, screws, clamps, tongue and groove, Velcro, or magnetic means, The housing may be of any shape but a cylindrical shape to tightly receive a standard water can and/or bottle is preferred. Said housing may be further insulated and/or have an external storage pocket.

A surfboard is disclosed herewith comprising an external housing and attachment means. The attachment means may comprise any known attachment technique such as receptacle means, adhesive means, suction means, screws, clamps, tongue and groove, Velcro, or magnetic means, The housing may be of any shape but a cylindrical shape to tightly receive a standard water can and/or bottle is preferred. Said housing may be further insulated and/or have an external storage pocket.

The invention provides a solution to people who want to enjoy therapeutic exercises in water using body boards but do not yet have the necessary skills to maneuver themselves alone. This invention serves as a way of acquiring these skills through a body board anchored to a fixed position and leaving a reasonable amount of space for the user to freely move his/her body without interfering with the operation of the board.

The invention provides a solution to people who want to enjoy therapeutic exercises in water using body boards but do not yet have the necessary skills to maneuver themselves alone. This invention serves as a way of acquiring these skills through a body board anchored to a fixed position and leaving a reasonable amount of space for the user to freely move his/her body without interfering with the operation of the board.

A saddle for an aquatic board is disclosed. The saddle is equipped with a strap or straps and/or edge wise clamps, or other suitably firm fastener, to engage and maintain position on the aquatic board positioned beneath the saddle. A user can then stand on the board and squeeze the saddle between their knees and ankles and maintain an enhanced balance on the board or, if fatigued, can sit or kneel alongside or on the saddle and paddle/ride from a seated or kneeling position. The saddle may be inflatable or solid and may include an inner void for storage for personal effects or equipment. The saddle may further include a speaker, cup holder, handles, or other optional features.

A saddle for an aquatic board is disclosed. The saddle is equipped with a strap or straps and/or edge wise clamps, or other suitably firm fastener, to engage and maintain position on the aquatic board positioned beneath the saddle. A user can then stand on the board and squeeze the saddle between their knees and ankles and maintain an enhanced balance on the board or, if fatigued, can sit or kneel alongside or on the saddle and paddle/ride from a seated or kneeling position. The saddle may be inflatable or solid and may include an inner void for storage for personal effects or equipment. The saddle may further include a speaker, cup holder, handles, or other optional features.