While we don't recommend gambling with your fitness plan, we couldn't resist this tip from Cameron McGarr, C.S.C.S., to keep cardio sessions interesting. Here's how it works:

Keep a deck of cards (remove the jokers and face cards) on the console of the treadmill. Every two minutes, draw two cards and add a zero to each number. The higher card indicates what percentage of your all-out effort you should employ, and the lower card tells you for how many seconds to do it, So if you drew a 9 and a 2, run at 90% of your full effort for 20 seconds. Drop down to 60% of your full effort for the remainder of each two-minute round. Our advice: Shuffle first.

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