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Low-Tech Doesn't Mean No Tech continued...

Cost: PowerBlock costs from $119 for a starter set to $349 for the elite trainer set. Select Tech by Nautilus (a different design with a similar principle) costs about $400 for one set of small adjustable barbells.

3. The Fit Deck. Love to play poker? You can quench your urge to gamble and get healthy at the same time with a workout aid called The Fit Deck. The concept is simple: A deck of 56 cards, most of which feature illustrated exercises, pointers on how to do them, and a suggested number of repetitions or a time frame for beginners, intermediates, and experts. The deck includes instructions for a variety of simple challenge games that provide a spontaneous, ever-changing variety of exercises.

"Think of the calisthenics you did in the fifth grade -- good clean fun that really worked to keep you in shape," says Black, who helped develop the cards based on the exercises he taught Navy Seals.

How It's Done: Each card displays an exercise - such as lunges or sit-ups - to be performed for a specific amount of time. A few cards are "jokers," which either let you skip an exercise (think "Get out of jail free" card) or make you double the exercise (think "Go directly to jail" card!) The cards are equally divided among upper, lower, and full-body workouts. To use, you simply shuffle the deck, then randomly choose 5-20 cards and start working out. (Ten cards will fill 10 minutes of exercise time, while 20 cards will fill 20 minutes, etc). Alternately there are simple instructions for various games you can play by yourself, or with two or more people. A slow-motion instructional DVD is available for those who need help with form.

Cost: $18.95 for one deck or $24.95 for the deck and an instructional DVD. Also available is the Fitness Deck Jr. for children, including a book of easy-to-learn games, for $14.95.

4. Bosu Balls. The Bosu Ball is based on the principal of the fitness ball, but is easier to use. It's shaped like an oversized beach ball cut in half, with the flat side attached to a wide, rigid base. This gives the ball stability, allowing users to easily perform a variety of muscle-toning routines, including stepping, lunges, and other moves while improving balance and flexibility.

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Heart Rate Calculator

Ensure you're exercising hard enough to get a good workout, but not strain your heart.

While you are exercising, you should count between...

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Beats
PER
Seconds