A jump rope simulator for aerobic and anaerobic exercise having a hand-held unit comprising a handle, a base length connected to the handle, and one or more concatenated extension lengths attached to the base length. To exercise, the user grasps one or two units, imitates the motions of swinging a conventional jump rope, and jumps up and down, but there is no risk to the user of tripping over a rope as with a conventional jump rope. If the user desires, two units may also be linked together with an easily attachable connector to form a device similar to a conventional jump rope. A user can quickly convert between the two configurations of the jump rope simulator.