Right-handers must bowl with their right foot on the mat. Left-handers must bowl with their left foot on the mat.
Note: You cannot change hands during a game.
Question: What if a bowler delivers a wood and does not have their foot on the mat? This happened recently at a Social.
Answer: The bowl is returned to be played again. If it occurs a second time, the bowl is forfeited.
References From the Laws Of The Game
5.3 A player’s foot must be placed on the footer when delivering either the jack or a bowl. A player placing the right foot on the footer must play the jack and bowls with the right hand, and a player placing the left foot on the footer must play jack and bowls with the left hand. Nothing in this Law shall apply to any player who suffers a permanent disability of a limb. The player must have a medical dispensation.
5.4 A player must bowl with the same hand throughout the game. Where disability or infirmity prevent a player from delivering jacks or bowls directly from hand than a mechanical aid, of a type approved by the Association, may be used to provide assistance.
5.5 Any bowl not played in accordance with Laws 5.3 and 5.4 may be stopped by the Referee and returned to be played again. If a player offends again during the course of the game, the bowl wrongly played shall be forfeited.