One step is the final pre-arranged sparring technique you learn. The attacker performs a hand or foot technique and the defender blocks and retaliates; either in the same move or quick succession.
One step seems to have different rules where ever you go. Some clubs/federations have both attacker and defender start in parallel stance at the start whilst others have the attacker pull back like normal. Simply follow the rules which your club adheres to.
One step sparring
