Exercising device for stimulating deep muscles and method for operating the exercising device

A method for operating the exercising device, the method comprising:

• providing the exercising device with a main body, the main body forming a container, the main body including a first end and a second end, and having a length defined between the first end and the second end, the container having an outer surface, an inner surface, and a hollow cylindrical shape with a cross-section which varies between the first end and the second end such that the outer surface and the inner surface define a waveform;
• detachably arranging a first cover on the first end and a second cover on the second end;
• and
• configuring the exercising device such that the cross-section varies between narrow cross-sections and wide cross-sections, the narrow cross-sections being present three times over the length of the main body, and the wide cross-sections being present four times over the length of the main body.

An exercising device for fitness training, the exercising device comprising:

• a main body forming a container, including a first end and a second end, and having a length defined between the first end and the second end;
• the container having an outer surface, an inner surface, and a hollow cylindrical shape with a cross-section which varies between the first end and the second end such that the outer surface and the inner surface define a waveform;
• a first cover detachably arranged on the first end;
• and
• a second cover detachably arranged on the second end,
• wherein each of the first cover and the second cover are made of soft rubber,
• wherein the main body includes cavities at the first and second end,
• wherein the first and second covers have portions protruding from inner surfaces of the first and second covers, and
• wherein the first and second covers are mounted on the main body by placing the portions protruding from the inner surfaces of the first and second covers into the cavities in the main body.