Bilateral retractable band/cord device with handles

A bilateral retractable band/cord exercise device, each side comprising:

• a. a hollow housing member, open at a top thereof and closed at a bottom there of, with a housing opening slot along a length of the housing member;
• b. a retraction spring cavity, open at a top thereof and closed at a bottom there of, contiguous with and covers the open top of said housing member, and having a retraction spring cavity hole in a bottom thereof;
• c. a spool/spindle element, disposed fully within said housing member and disposed partially within said retraction spring cavity through said retraction spring cavity hole;
• d. a retraction spring, disposed within said retraction spring cavity with a center tab attached to the partially disposed said spool/spindle element;
• e. a retraction spring cavity top, closing the open end of said retraction spring cavity;
• f. a shared stretchable elastic band/cord element, with one of a pair of opposite short ends passing through said housing opening slot and connected to said spool/spindle element;
• g. a rectangular locking mechanism pivotably affixed to an exterior of said housing configured to be pressed against the shared band/cord element by a user;
• h. a spool axel said retraction spring to spin said spool/spindle element from inside said retraction spring cavity leading said shared band/cord element to either be allowed to retract around said spool/spindle element within said housing member or to protract from said spool/spindle element away from said housing member through said housing opening slot,
• whereby said band/cord element is bilaterally retractable/protractible for adjustability accommodating exercise variety and portability.