Lounge furniture is great, but not necessarily for long hours of work. Provide tables and power around you in a more relaxed setting so that you can be productive if you choose to not have a traditional work surface like a desk. Whatever you do, don’t skimp on the chairs. They are so important to your health. Make sure you give people the option to sit or to stand. Again, it’s a health thing–and standing to work is becoming increasingly popular. Give people options.
Although they are increasingly popular, I don’t have any treadmill desks in my space because so far I’ve found them incredibly expensive, noisy, and quick to break.