This week at Lifehacker: Drive Firefox with your keyboard. Carry around secure data backups on your iPod. Optimize your Mac's broadband connection. Learn all the right gym moves using exercise videos on your iPod.

You call yourself a geek and you didn't know that Control/Command-K will snap your cursor up to the Firefox search engine box? And that Control/Command-Down and Up will switch up engines? Click thee to our guide to mouse-less Firefox and shun that rodent while you surf faster and more efficiently.

Some people have redundant arrays of disks backing up their pirated movies, porn, and Word documents of college papers. Others just use their iPod. Stick an encrypted disk image of your personal data in your pocket along with the 10,000 MP3's you never listen to. This way when your house burns down along with the multiple replicating file servers, you'll still have off-site iPod backup.

Enlarge the data pipe that connects your Mac to the 'net. Apple's free Broadband Tuner increases buffer sizes to take full advantage of broadband connections on OS X. Remember, when it comes to buffers, size does matter.

Are you the uncoordinated fool at the gym flailing about pulling leg muscles while trying to master the art of the crunch? Download free exercise videos to your iPod to get those moves right and give you something to look at other than the gaggle of hotties pointing and giggling in the corner.

Lifehacker's Power User column appears every Wednesday on Gizmodo.

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