These players may defend a zone in front of their team's defence, or man mark specific opposition attackers.[21][22][23] Defensive midfielders may also move to the full-back or centre-back positions if those players move forward to join in an attack.[24][25] Sergio Busquets described his attitude: "The coach knows that I am an obedient player who likes to help out and if I have to run to the wing to cover someone's position, great."[25] A good defensive midfielder needs good positional awareness, anticipation of opponent's play, marking, tackling, interceptions, passing and great stamina and strength (for their tackling).