The ball carrier’s responsibility is to win the contest at contact, and look after the ball. Currently, the law allows for the player carrying the ball to have 2 “fights” with the ball. The first is the fight in contact, and the second is the fight on the ground that allows the player to twist into an advantageous position and retain control of the ball on the ground. This second fight is incredibly important, and the player needs to use this opportunity to change body position and get the ball as far away from the opposition as possible. This is where that core strength you’ve been practicing will come in handy.