Low levels of habitual physical activity, poor aerobic fitness, and obesity have been associated with an increased risk of type 2 diabetes (1-9). to an extent, the elevated risk of type 2 diabetes associated with physical inactivity and obesity is mediated by other risk factors such as glucose intolerance and insulin resistance (10-17). Thus, althogh low levels of physical activity, poor aerobic fitness, and overweight are strong predictors of type 2 diabetes and metabolic risk, the independent contribution of these factors is not firmly established (18-21)