public void addPlayer(Player p, Arena a){
		for(Arena s : arenas){
			if(s.getPlayers().contains(p.getName())){
				p.sendMessage("You are already in an arena");
				return;
			}
		}
		if(a.getPlayers().contains(p.getName())){
			p.sendMessage("You are already in that arena");
			return;
		}
		a.addPlayer(p);
		p.teleport(a.getSpawn());
		p.sendMessage("You have joined the arena");
	}