I don't know about you, but I've found not doing anything for weeks makes activities even harder to do once I get back into them...

For instance, a month ago I could go on long walks, check my e-mail and watch television, but I decided to take a break for a week. Afterwards, even just watching TV for 5 minutes was enough for the symptoms to really increase. From then on I've been GENTLY pushing myself to get more and more into light activities, and now I can go on my PC and talk to people for a couple of hours without the symptoms getting really bad.

Think of it as a muscle: if you stop using it, it eventually gets feeble.