Forget the stereotype of the gadget-loving couch potato. These innovations can help you stay trim, monitor your fitness and even save your life.

By now you must have heard of the Wii Fit, a high-tech device from Nintendo designed to help gamers and non-gamers alike lose weight and get into shape.

The selling point is that the whole thing is fun – you hardly notice you're being frogmarched to fitness. Nintendo's philosophy is this: why sweat it out in a crowded gym, which strips you of a large chunk of cash (and dignity) every month, when you can exercise in the comfort of your own home, and enjoy yourself at the same time?

The Wii Fit syncs with a Nintendo Wii games console and instructs you to perform a number of manoeuvres, from basic muscle stretches to Yoga poses. Built-in software records your height and weight, then works out your body mass index (BMI). The more you play, the healthier you'll become – we found it's so addictive we suspect you'll be on the Wii Fit more often than you'd ever visit the gym – and you can monitor your progress.

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