I'm not sure if you guys know this, but yoga is kind of awesome. It helps you relieve stress while exercising and increasing stamina and/or strength. It also helps boost your immune system. I like to do yoga in the comfort and privacy of my room while catching up on my Hulu queue or watching Netflix. I started doing yoga every morning for about an hour two weeks ago. I haven't been doing it while I've been sick because it causes coughing fits which are no fun. My yoga routine tends to be a mix of strength and cardio yoga. The following poses comprise my main routine, but sometimes I'll do other poses too.
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I also like to (well actually force myself to) do sun salutations, which I have the most trouble with. Right now I can only do two at a time. I also do cobra pose, which I actually enjoy, alternating with child's pose. It's really great for stretching your back and stomach.
I have also discovered this site which is a great source for yoga beginners. It says beginner poses but look at those arm balances! So they're clearly not all beginner poses but still a wonderful resource.