How and where can I do something strenuous which will get my heart pumping and my muscles aching? I could go walking/to a gym but I'd rather do something useful, e.g. gardening, babysitting (!). It's a shame there's only one beer festival a year (constructing fences, etc is very tiring).

I went to a careers workshop and have come to the conclusion that, as much as I like it, either something needs to change or I need to get out of Cambridge when I finish my PhD. Currently thinking of exotic places such as the US, Canada, Oz or NZ.