Glossary of Judo terminology
The "Support leg" is used as the fulcrum leg when executing a Judo Waza, being the leg which supports the contestant's center of gravity. When executing a Waza, the contestant shifts his / her weight to this support leg, using that leg to support the load of a shoulder throw, or to serve as the leg on which to center a swiveling Waza. Placing too much of one's body weight on the support leg poses the risk of being easily destabilized if that leg is scooped or swept out from under you by the opponent. Preventing this in an actual contest requires careful stepping with the Tsugi-ashi (Following step) and skillful Tai-sabaki (Body shifting / Body control) .