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We've heard it all before: desk work is wrecking havoc on our health. 

But experts warn that, while 86 percent of Americans work at a desk, few of us know how to offset the damage. 

If you spend at least six hours a day at a desk, your heart attack risk is double what it should be. Computers also increase your risk of vision loss by 40 percent, increase insulin resistance, and affect our mental health. 

This culture of working has given rise to the 'weekend warrior' who packs a week's worth of exercise into two days, and after-hours yoga or meditation.