disputes during play may also be settled with a ball-up from the point of contention. If the ball is kicked or hit from a ball-up or boundary throw-in over the boundary line or into a behind post without the ball bouncing, a free kick is paid for out of bounds on the full. A free kick is also paid if the ball is deemed by the umpire to have been deliberately carried or directed out of bounds. If the ball travels out of bounds in any other circumstances (for example, contested play results in the ball being knocked out of bounds) a boundary umpire will stand with his back to the infield and return the ball into play with a throw-in, a high backwards toss back into the field of play. The ball can be propelled in any direction by way of a foot, clenched fist (called a handball or handpass) or open-hand tap but it cannot be thrown under any circumstances. Once a player takes possession of the ball he must dispose of it by either kicking or handballing it. Any other method of disposal is illegal and will result in a free kick to the opposing team. This is usually called "incorrect disposal", "dropping the ball" or "throwing". If the ball is not in the possession of one player it can be moved on with any part of the body. A player may run with the ball, but it must be bounced or touched on the ground at least once every . Opposition players may bump or tackle the player to obtain the ball and, when tackled, the player must dispose of the ball cleanly or risk being penalised for holding the ball unless the umpire rules no prior opportunity for disposal. The ball carrier may only be tackled between the shoulders and knees. If the opposition player forcefully contacts a player in the back while performing a tackle, the opposition player will be penalised for a push in the back. If the opposition tackles the player with possession below the knees (a low tackle or a trip) or above the shoulders (a high tackle), the team with possession of the football gets a free kick. If a player takes possession of the ball that has travelled more than from another player's kick, by way of a catch, it is claimed as a mark (meaning that the game