Body-training apparatus and devices for physical exercises, namely, jump ropes; jump rope kits, comprising groupings of components used for the creation of a jump rope, namely, handles, cable, cord and attachment devices such as beads, nuts, collars, screws, crimps and bushings; accessories, comprising materials used for the production and maintenance of jump ropes, namely nuts, collars, screws, crimps, bushings, beads, cable, cord, handles, end caps and handle tape; speed ropes, trainer rope...