I'd like to train for a marathon, are there any clubs for this in Hyde Park?

I don't know of any clubs specifically for running in Hyde Park; I've looked again and didn't come up with anything. Chances are you might be able to find something in the area, but not necessarily in this town.

The most I can say is that there are places in which you can run in Hyde Park by yourself or with a friend as there is a series of trails criss-crossing the town.