An easily-assembled bicycle for use by bed-ridden persons is provided. In an embodiment, the present invention is capable of being used in conjunction with both adjustable and non-adjustable beds or other person support. The present invention allows for hand or leg exercises or simultaneous hand and leg exercising (pedaling). In an embodiment, the bicycle includes an anchoring base unit, a top-side unit, a foot-pedal unit and a hand-pedal unit. Use of the present invention allows bed-ridden persons to exercise without depending on health-care workers and helps avoid the serious negative health consequences associated with lack of physical exercise (e.g., loss of muscle strength, calcium depletion, pulmonary embolism and bed sores).