Using a computer has obvious personal and professional benefits, but there are some physical issues that arise when you sit in front of a computer (or tote one home — save your back!). You can do basic exercises to avoid carpal tunnel, but you can use technology to prevent injuries caused by technology: Workrave!
Workrave is a free download (for Linux and Windows) that provides all kinds of handy tools to ensure that you don't hurt your eyes, back, wrists, or neck while you're working (read: perusing Sugar sites). My favorites are the timers for breaks it prompts you to take — and one break even walks you through simple exercises.
You can also set a daily limit, so that it will pop up and remind you that you're at your limit and should maybe get up and out, lest you suffer from one of those pesky Internet addictions.