Apparatus with springs connected to two handles; it is stretched with the hands to develop the muscles in the upper torso and the arms.
twist bar
Bar consisting of a tension spring and two grips; the athlete bends it to strengthen the upper part of the body (such as the arms and shoulders).
tension spring
Metal elastic part that bends from the force the athlete exerts on its ends; it then returns to its original shape.
grip
Part by which the athlete holds the twist bar.
jump rope
Cord with handles that is repeatedly swung over the head then jumped over; the athlete jumps once per cycle to strengthen mainly the leg and buttock muscles.