A transportable exercising apparatus comprising a frame at which is secured a structure supporting the user’s body while its hand or foot is in use, and that can be adjusted according to user’s needs. The energy related information includes: an energy level and a maximum storage capacity of the energy storage module; an energy harvest rate and energy consumption rate. The digital clock element is configured to generate a digital clock output. Other embodiments are also described. Some implementations are environmentally-neutral. If it is data for printing to which the control command is appended, then the control unit does not execute any image forming operation, but instead stores this data for printing with the control command appended in the storage unit.