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  Climbing stairs  can help you stay fit, say researchers in Ireland.  They came to the conclusion after analyzing benefits of climbing stairs once or twice over the course of a workday.   “I think the key thing here, is that stair-climbing is one of the few everyday activities at a moderate to high intensity that one can do surreptitiously without having to change, use special equipment or look foolish,”   The Globe and Mail  quoted Colin Boreham, a professor at the   University College Dublin Institute for Sport   and Health as saying.   In the study, boffins asked eight undergraduate women to undertake an eight-week program that started with climbing a 199-step staircase twice a day, five days a week, climbing 90 steps a minute.   Compared to a group of matched controls, 17 per cent of aerobic   fitness   increased in the stair-climbers and reduced harmful LDL cholesterol by 8 per cent.   By the end of the study they all were climbing averagely five times in a whole day th