bar segment 72 is fitted to a corresponding threaded coupling 78 of bar segment 74 optionally and again as shown in fig4 and fig5 the bar 70 may include additional weights 80 and 82 which are circular disks each having a central aperture allowing them to be slipped over male threaded coupling 76 and secured between bar segments 72 and 74 the lengths and weights of the bar segments 72 and 74 may be essentially identical or may differ significantly for example each bar segment may be about 76 cm to 100 cm or about 2 5 to 3 feet in length with a total assembled bar length of about 150 to 200 cm or about 5 to 6 feet a first bar segment may weigh about 0 9 kilograms or 2 pounds and be supplied with a second bar segment weighting about 2 3 kg or about 5 pounds bar segments that are relatively close in length and weight are preferred for allowing the user to hold one bar segment in each hand bar segments that differ significantly in length or weight allow the user to use only one bar segment or the other to provide a desired weight and length for exercising optionally the device may include a conventional timer or calorie counter of the type that calculates a number of calories burned based on the user 39 s weight and elapsed exercise time optionally the device may include a counter that displays the number of u201c twists u201d or movements completed by the user if a timer calorie counter or other counter is provided a display 65 as.