Skillful or vigorous use of the legs, as in dance or sports.
Work, especially research or preparation, that involves significant walking, travel, or similar effort.
A small balloon released into the sky to determine the direction and tendency of winds in the upper air before a manned ascent in a larger balloon; a ballon d'essai.
An idea, suggestion, or prospective action, product, etc., offered to an audience or group in order to test whether it generates acceptance or interest.