jumping jack

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A toy figure with jointed limbs that can be made to dance by pulling an attached string.
• noun Sports A physical exercise performed by jumping to a position with the legs spread wide and the hands touching overhead and then returning to a position with the feet together and the arms at the sides.

from The Century Dictionary.

• noun A toy consisting of a human figure which is caused to jump, dance, or go through various contortions, by pulling a string attached to its limbs.

from the GNU version of the Collaborative International Dictionary of English.

• A toy figure of a man, jointed and made to jump or dance by means of strings or sticks attached to it.
• A calisthenic exercise in which a person starts in a standing position with both feet together and with the arms at the sides, then leaps into the air while moving the arms outward and upward so that the hands touch above the head, and then returns to the original position by reversing the motion of legs and hands.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A physical exercise performed by jumping to a position with the legs spread wide and the hands touching overhead and then returning to a position with the feet together and the arms at the sides.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun plaything consisting of a toy figure with movable joints that can be made to dance by pulling strings