A device that propels a swimmer to move above or below the water surface allowing it to ascend, dive or turn on its axis is disclosed. It allows great capability of movement in water, due to its control fins. This allows it to be used as a sport, recreational, water use item, such as diving or to equip lifeguards or water rescue teams that need to move at higher speeds.

A device that propels a swimmer to move above or below the water surface allowing it to ascend, dive or turn on its axis is disclosed. It allows great capability of movement in water, due to its control fins. This allows it to be used as a sport, recreational, water use item, such as diving or to equip lifeguards or water rescue teams that need to move at higher speeds.

Embodiments of water activity board 10 that may be configured with several components 210A-H to form a WABS 200, where the components 210A-H may be securely and removably coupled to the board 10 via one or more rail modules 100A-I. Other embodiments may be described and claimed.

Disclosed is a swimming assistance apparatus, which is worn on a user's both feet to provide the user with buoyancy, such that the user can float on water and swim in a good swimming style while repeatedly moving the waist from side to side like a fish, thereby reinforcing the user's waist muscles. Persons who have knee joint arthralgia or backache or persons who have disability in the lower body can use the swimming assistance apparatus for medical purposes, such as pain relief or treatment.

Disclosed is a swimming assistance apparatus, which is worn on a user's both feet to provide the user with buoyancy, such that the user can float on water and swim in a good swimming style while repeatedly moving the waist from side to side like a fish, thereby reinforcing the user's waist muscles. Persons who have knee joint arthralgia or backache or persons who have disability in the lower body can use the swimming assistance apparatus for medical purposes, such as pain relief or treatment.

A device that propels a swimmer to move above or below the water surface allowing it to ascend, dive or turns on its axis is disclosed. It allows great capability of movement in water, due to its control fins. This allows it to be used as a sport, recreational, water use item, such as diving or to equip lifeguards or water rescue teams that need to move at higher speeds.

A device that propels a swimmer to move above or below the water surface allowing it to ascend, dive or turns on its axis is disclosed. It allows great capability of movement in water, due to its control fins. This allows it to be used as a sport, recreational, water use item, such as diving or to equip lifeguards or water rescue teams that need to move at higher speeds.

Disclosed is a swimming assistance apparatus, which is worn on a user's both feet to provide the user with buoyancy, such that the user can float on water and swim in a good swimming style while repeatedly moving the waist from side to side like a fish, thereby reinforcing the user's waist muscles. Persons who have knee joint arthralgia or backache or persons who have disability in the lower body can use the swimming assistance apparatus for medical purposes, such as pain relief or treatment.

Disclosed is a swimming assistance apparatus, which is worn on a user's both feet to provide the user with buoyancy, such that the user can float on water and swim in a good swimming style while repeatedly moving the waist from side to side like a fish, thereby reinforcing the user's waist muscles. Persons who have knee joint arthralgia or backache or persons who have disability in the lower body can use the swimming assistance apparatus for medical purposes, such as pain relief or treatment.

A system, methods and apparatus for powered monofin that propels a swimmer through water uses one of two modes of power: 1. An electric-assist mode, in which the propulsor responds to a swimmer's kick by multiplying the work of the swimmer; 2. Inverse mode, in which the propulsor deactivates when the swimmer is working. In this mode, propulsion is inversely related to the work of the swimmer. As the swimmer does more work, power from the monofin is reduced, to a predetermined, average level of propulsion. As the swimmer does less work propulsion increases to the predetermined level.