 The position of the full back requires that the player have decent speed over short bursts, strength, and good hand eye co-ordination.In playing either cornerback or full back positions a well-developed aerobic system is required although, unlike the corner backs, the full back is needed to make short burst sprints both away from and into the goal area.The role of the half backs who wear the 5 (right) and 7 (left) jerseys is less defensive than that of the corner backs.