This Regatta centre is awesome (especially if you've come here to practice/ take part in dragon boat racing!) http://www.lclionsclub.co.uk/#/2013-programme/4560417477
The centre is a couple of minutes walk from Royal Albert DLR station, and has a 2000m course, changing rooms, lockers lots of dragon boats and a restaurant upstairs. I think someone mentioned a gym as well, but I didn't wander in there.
I came down here to practice with team mates from the Hong Kong Economic and Trade Office (we were a corporate team, so only had one practice before race day.) The awesome team, Raging Dragons instructed us, gave us lots of helpful advice and showed us how not to make too much of a fool of ourselves on the water.
They (the Raging Dragons) mentioned that they are always looking for new members, so if you live near here and fancy getting fit in a fun, slightly splashy way, get involved! http://www.ragingdragons.co.uk/ (They said training was on Thursday nights and Sunday mornings.)
*I have a feeling dragon boat racing is a very good way to improve arm and tummy muscles if you don't mind the ache the following day!* read more