My father learned to juggle when he broke his leg. We had bruised apples and oranges all winter.
If you have time to watch TV and post to online forums (which shall remain nameless) you've got time to knit. I knit a row, then check for new posts, then knit another row, check for new posts, etc. Knitting teaches you patience, lowers blood pressure, and helps you sleep. Plus, if you sip a little whisky along with it, you wind up with some really "interesting" kilt hose.