Even then you will be lying in bed and will exercise on specially-designed equipment.

Following 70 days, there is a 14-day rehabilitation period to get your body back into shape.

If all this sounds like your dream come true, applications can be made here.

Self-described ‘pillownaut’ Heather Archuletta has taken part in the study three times.

‘I'm a very active person, so it's difficult to be restricted to bed sometimes, but many of us are willing to do it for the sake of future space exploration,’ she wrote on her blog.

‘The... money... is... pretty freaking awesome, however. About $5,000 per month, which is great if you've just graduated, can't find a job, are between jobs, or just plain love space exploration,’ added Ms Archuletta.

A similar study is being undertaken by the European's Space Agency's (ESA) Programme for Life and Physical Sciences at the Medes Institute in Toulouse, France.

But while it may sound like easy money, it isn’t the walk in the park that it might first seem.

During extended periods, microgravity takes a serious toll on the human body.

Without the pulls of normal gravity, blood doesn't flow downhill, but pools in the extremities including the face, hands and feet, causing a puffy appearance.

And without that downward pressure, height increases.

Body mass often decreases with a loss of muscular tissue from nitrogen depletion; the veins and arteries of the legs become weaker, anaemia occurs, accompanied by a reduction in blood count.

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