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Aerobic exercisers that may consist simply of a rope or cord that users swing over themselves and jump or skip over each time it reaches the feet and the two handles that users hold. The cords may be made of nylon, polyvinyl, cotton, steel, leather, or rubber, and some cords may be braided or segmented and/or permit length adjustment; the handles can be wooden or plastic and may be mounted with removable weights to add resistance to the muscles involved in the exercise. Jumping rope aerobic exercisers are intended to increase cardiovascular endurance by keeping the heart and pulmonary rate elevated for a continuous period of time. Additionally, they provide strength and endurance to the muscles of the upper body (i.e., arm, chest, back), lower body, and abdomen; they can also contribute to the development of coordination and balance for the users.
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