Exercise systems

An exercise system, comprising:

• a curved body comprising a first peak and a second peak and a trough disposed between the first peak and the second peak that defines a separation distance between the first peak and the second peak, the body extending longitudinally along a longitudinal axis and a laterally along a widthwise axis perpendicular to the longitudinal axis;
• the first peak and the second peak are separated by the separation distance in the longitudinal direction, the first peak extending a first distance in the longitudinal direction and the second peak extending a second distance in the longitudinal direction, the first distance being greater than the second distance;
• a first storage cavity disposed underneath the first peak and a second storage cavity disposed underneath the second peak;
• a bottom portion including a planar lower surface comprising at least one removable cover configured to open and close and thereby selectively provide access to the first storage cavity or the second storage cavity;
• the curved body including a core component and a surface component surrounding the core component;
• and
• the curved body having at least one aperture extending laterally therethrough for securing an elastic band therein and being disposed underneath the first peak, the at least one aperture comprising an upper surface having a curved shape generally corresponding to a curvature of a top surface of the first peak.