Abstract: Several embodiments of a foldable and transportable elliptical exercise machine are disclosed which include pedal arms and optional corresponding load bearing rails that are folded to an upright position for storage and transportation. The pedal arms are shaped to optimize user safety and exercise productivity. The device housing can include movable portions that optimize safety during use, but accommodate the pedal arms in the upright and folded position.

Abstract: A magnet-type resistance generator is to be used with an exercise apparatus which has a flywheel and includes a magnet unit with a curved housing which confines a groove and which has opposite inner wall surfaces that are respectively provided with a plurality of permanent magnets which extend into the groove. A tubular sleeve extends from a rear side of the curved housing and has a distal end which is formed with an internally threaded portion. The tubular sleeve is received slidably in a tubular slide seat. A guide bolt extends axially into the slide seat and has a threaded portion that engages the internally threaded portion of the tubular sleeve. A slide potentiometer has a slider connected to the curved housing of the magnet unit.