healthy really need break sweat exercise say experts official advice minutes gentle exercise day enough improve health revised scientists first developed international fitness guidelines members american college sports medicine concerned advice misconstrued may take include simple stroll car multitude least minutes moderate exercise five days week minutes vigorous exercise like jogging three days week say disarray ideal amount intensity exercise meliorate health agree fixture exercise essential world health organisation said minutes gentle exercise daytime could enough sustain minimum level fitness recently researchers queen university belfast found walkto half hour three days week gave standardized fitness blood pressure benefits walking minutes fivesome times week sports scientists however say advice misleading could encourage people picayune exercise people accepted others misinterpreted original passport people continue believe vigorous intensity activity improve wellness others believe wanton activities daily lives sufficient promote health told circulation journal american heart association original recommendations quickly adopted tenseness adults need top routine activities casual walking housekeeping structured exercise admit vigorous jogging moderate aerobic physical exertion brisk walk well activities weight coach maintain addition muscular strength endurance people poor bouts exercise count towards weekly goals must last least minutes say even exercise may benefits however research also shown a lot exercising damaging body professor paul gately professor exercise obesity leeds metropolitan university told guardian difficult apply advice people adiposis would time of day exercise day keep weight going change diets said