Excess body weight and lack of physical activity is known to contribute to chronic health conditions.   Australia ranks in the worst third of OECD countries for obesity among people over the age of 15 with a whopping 63% of Australians said to be either overweight or obese.  And this trend is on the increase; back in 2004 - 2005, the National Health Survey indicated that just over half of us (54%) were classified as overweight or obese.  We have a growing problem (pun intended).