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If you're looking to keep fit and active on the job than you might want to ditch your computer keyboard for a fire hose. The health website CalorieLab.com has worked out which occupations burn the most calories based on a 150lb person. Typing uses just 34 calories per hour while fire fighting burns 748. Forestry is revealed as the most physically exerting job, with all that chopping working off a whopping 1,088 calories every 60minutes.   Easing knots out of peoples' backs as a massage therapist burns 204 calories an hour according to CalorieLab, while fruit picking uses 238 and dancing 258. Truck driving is also shown to be a grueling occupation, expending 374 calories an hour, and professional diving uses up twice as much energy. Fitness expert John Rowley told Monster.com how divers - who work offshore to help construct or maintain platforms for the oil and gas industry - must be extremely fit. As a result the average pay is $67,200 per annum. 'Diving incorporates deliberate breathing, full body movement, additional resistance by fighting the current and your body has to adapt to water temperatures, all of which will help burn calories,’ Mr Rowley said. A study by the Public Library Of Science in 2012 found that over the past fifty years, the percentage of jobs held by Americans that required physical exertion had fallen from 50 to 20per cent. That means both men and women burn over 100 calories less than they used to each day. While physical activity brings many benefits, two studies released last year suggest that jobs involving hard manual labor may actually increase the risk of heart disease. Dr Els Clays, from the University of Ghent, Belgium, who was involved in the reserach said that jobs which demand a lot of heavy lifting appear to be more taxing on a body in a way that doesn’t benefit health like going for a run. He concluded: 'The hypothesis based on our study and other recent literature is that physical activities done on the job usually include more static activity types which do not have a training effect on the cardiovascular system, but have an overloading effect on the system. 'If people are exposed to that for a long time, like multiple hours during the day, that can really have an adverse effect on their cardiovascular health.' It’s also possible that those with physically draining jobs may witness more health complications as manual labor often pays less and provides limited health insurance.  Dailymail
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