I use gyms a lot and I agree with the majority here, Dulwich is good. Is it "crowded"? Well, it's like the trains - it's busier at peak as all gyms are. It's also at its busiest in January and Feb, for obvious New Year reasons. Is there a "problem" with bookng? The classes exist and they're often full so a lot of people don't have a problem. It's really about planning ahead and booking online. If you have one, I'd suggest setting up reminders on your smartphone. If the biggest problem Dulwich has is its popularity, things could be worse.
