A device configured to apply a compressive force to a foot, the device being at least partially operated, controlled, and/or activated by one or more electronic circuits, wherein: the device is configured to deliver a compressive force to the venous plexus region of the foot in use, wherein the device is characterised by: comprising a single pressure pad, wherein the pressure pad is retractable and comprises a rigid or semi-rigid structure configured to operably press against a person's foot to transfer the compressive force to the foot; and the pressure pad is coupled to a power generation mechanism capable of and being configured to move the single pressure pad between: an extended position, where in use the single pressure pad delivers a compressive force to the venous plexus region of the foot; and a retracted position, where in use the compressive force is relaxed to allow the veins within the venous plexus to refill with blood; wherein the device comprises electronic controls; and further comprises indicators configured to receive input from a user and/or to deliver feedback to a user; and wherein the device further comprises a shoe, sandal or other item of footwear, and the device fits within the shoe, sandal or other item of footwear. the device is configured to deliver a compressive force to the venous plexus region of the foot in use, wherein the device is characterised by: comprising a single pressure pad, wherein the pressure pad is retractable and comprises a rigid or semi-rigid structure configured to operably press against a person's foot to transfer the compressive force to the foot; and the pressure pad is coupled to a power generation mechanism capable of and being configured to move the single pressure pad between: an extended position, where in use the single pressure pad delivers a compressive force to the venous plexus region of the foot; and a retracted position, where in use the compressive force is relaxed to allow the veins within the venous plexus to refill with blood; wherein the device comprises electronic controls; and further comprises indicators configured to receive input from a user and/or to deliver feedback to a user; and wherein the device further comprises a shoe, sandal or other item of footwear, and the device fits within the shoe, sandal or other item of footwear. comprising a single pressure pad, wherein the pressure pad is retractable and comprises a rigid or semi-rigid structure configured to operably press against a person's foot to transfer the compressive force to the foot; and the pressure pad is coupled to a power generation mechanism capable of and being configured to move the single pressure pad between: an extended position, where in use the single pressure pad delivers a compressive force to the venous plexus region of the foot; and a retracted position, where in use the compressive force is relaxed to allow the veins within the venous plexus to refill with blood; wherein the device comprises electronic controls; and further comprises indicators configured to receive input from a user and/or to deliver feedback to a user; and an extended position, where in use the single pressure pad delivers a compressive force to the venous plexus region of the foot; and a retracted position, where in use the compressive force is relaxed to allow the veins within the venous plexus to refill with blood; wherein the device comprises electronic controls; and further comprises indicators configured to receive input from a user and/or to deliver feedback to a user; and