It is very nice just being able to grab your shoes and chalk and go, without having to arrange or co-ordinate anything with anyone else. So I can heartily recommend bouldering for the solitary and antisocial. *g*

Although I always seem to end up chatting to other people who are bouldering and taking turns on problems and swapping ideas and generally interacting, all which is completely uncharacteristic of me when it comes to offline interaction.