Abstract: A system and methods for generating electricity through a commensal relationship between a moving object and a generation unit. A generation unit includes a generation unit magnet positioned to pass through an induction coil. In certain embodiments, a moving magnet associated with a moving object attracts the generation unit magnet and, accordingly, causes the generation unit magnet to pass through the induction coil. The passage of the generation unit magnet through the induction coil generates electricity.

Abstract: The invention performing abdominal exercises includes a rigid shell having a rear portion and a sidewall rigidly attached to the rear portion and extending forward from the rear portion to define an inner chamber. The sidewall forms a rim defining an opening adapted for sealably attaching to the abdominal portion of the body. A vacuum mechanism in fluid communication with the chamber creates suction within the shell such that to contract the abdominal muscles the applied suction must be counteracted by the abdominal muscles. Contracting the muscles against the suction produced by the vacuum exercises the abdominal muscles.

Abstract: A progressive resistance exercise device is provided. The progressive resistance exercise device includes a vacuum chamber of the progressive resistance device having a size to span an abdomen of the user from approximately just below a breastbone to approximately just above a pelvic bone of the user and a vacuum source coupled to the vacuum chamber, said vacuum source and vacuum chamber together being operable to provide progressive resistance to abdominal contractions of the user.