Oxygen enhanced exercise and rest system

A breathing system, comprising:

• a breathing apparatus, comprising:
• a rigid base structure having a top portion, a bottom portion, an internal surface, and an external surface, wherein the top portion contains an arcuate section for covering a user's nose and the bottom portion is wider than the top portion for covering a user's mouth, the base structure contains an outer edge;
• a facepiece is engaged to the outer edge of the base structure and surrounds the base structure;
• two side passageways, each being disposed on opposing sides of the base structure and each being surrounded by a rim on the external surface of the base structure that extends outwardly from the external surface;
• and
• two hose attachment rings, each being selectively secured to one of the rims;
• a storage device;
• two flexible hoses separately connected to the storage device, each connecting to one of the two hose attachment rings, such that the two flexible hoses connect to the breathing apparatus on the opposing sides of the base structure;
• and
• an oxygen supply,
• wherein each of the two hose attachment rings includes a first concentric ring, a second concentric ring, and a hollow tube, a first concentric ring including a shelf extending radially inward at an end of the first concentric ring, the shelf defining a juncture between the first concentric ring and the hollow tube, the second concentric ring extending from the first concentric ring in a direction opposite the hollow tube, the second concentric ring including a diameter smaller than that of the first concentric ring, and the second concentric ring is adapted to receive a corresponding rim therein, and
• wherein the corresponding rim includes a key protruding radially outward form an end of the corresponding rim distal to and offset from the rigid base stricture, and each of the two hose attachment rings including a lip and a ridge, the lip extending radially inward from an end of the second concentric ring distal to the first concentric ring, the lip forming a keyed opening sized to receive the key, and the ridge extending radially inward at a position axially offset from the lip and circumferentially aligned with the keyed opening.