Health and fitness device

A device, comprising:

• a casing having an outer surface comprising a substantially spherical shape, the casing having a first opening and a second opening disposed along an axis of the casing;
• a tension mechanism unit housed within the casing and coupled to an inside surface of the casing;
• a first strap projecting through the first opening, the first strap having a first end and a second end;
• a second strap projecting through the second opening, the second strap having another first end and another second end, the first strap and the second strap being configured to retract into the casing, the first end and the another first end being coupled to the tension mechanism unit;
• and
• a first fastener disposed at the second end and a second fastener disposed at the another second end, the first fastener and the second fastener being configured to detachably couple together.

An apparatus, comprising:

• a housing having an outer surface comprising a substantially curved three-dimensional shape, the housing comprising a top housing portion and a bottom housing portion, wherein the top housing portion and the bottom housing portion are detachably coupled using an elastic band;
• a shell located within the housing, the shell having an outer surface comprising a substantially spherical shape, the shell comprising a top shell portion and a bottom shell portion, wherein the top shell portion and the bottom shell portion are detachably coupled using a fastening mechanism;
• a tension mechanism unit located within the shell, the tension mechanism unit comprising a spring loaded device configured to generate a tension and a tensioner configured to adjust the tension;
• a first strap having a first end and a second end;
• and
• a second strap having a third end and a fourth end, the first strap and the second strap being configured to retract within the shell based upon the tension, the first end and the third end being coupled to the tension mechanism unit, the second end and the fourth end being configured to detachably couple together.