Someone

public OnGameModeInit()
{
	SetTimer("AreaCheck", 1000, 1);
	return 1;
}

public AreaCheck()
{
	for (new i=0; i<MAX_PLAYERS; i++)
	{
		if(IsPlayerInArea(i, min x, max x, min y , max y);  // checkpoint bla
		{
			new Float:x, Float:y, Float:z;
			SetPlayerPos(i, x, y, z);
		}
	}
	return 1;
}