Instead of asking how much exercise we need, some scientists are looking into how little we can do and still get maximal health and fitness benefits. Good news! While many of us wonder just how much exercise we really need in order to gain health and fitness, a group of scientists in Canada are turning that issue on its head and asking, how little exercise do we need? The emerging and engaging answer appears to be, a lot less than most of us think - provided we're willing to work a bit.