According to a study by scientists at the University of Sidney, short spurts of vigorous exercise that leave you breathless are better than longer bouts of gentle exercise when it comes to preventing an early death! But what if you’re disinclined to do either? Surely the question natural couch potatoes should be asking is, why do tortoises have such a long life expectancy? If on the other hand you possess a natural va va voom, then you should try the ‘P90X’or ‘Insanity’ workouts on the basis that what doesn’t kill you makes you stronger! My own personal preference? When it comes to short bursts of vigorous exercise, I prefer to go old school…sex! (with a partner).