Just 20 minutes of brisk walking a day may be all it takes to lessen a sedentary person's risk of early death, says a new study. The researchers also found the risk of early death due to lack of exercise are double that posed by obesity and does not necessarily depend on being obese or overweight. When they analyzed the data, the researchers found that compared with the number of deaths linked to obesity, twice as many were linked to lack of physical activity - and, moreover - just a modest increase in physical activity could make a difference, especially among inactive people. The analysis found that doing exercise that burned just 90-110 calories a day - the equivalent of a daily 20-minute brisk walk - was enough to move an individual from the inactive to the moderately inactive group and reduce their risk of early death by 16-30%. Before reading this article I thought that obesity is dangerous than not doing physical activity because I watched a documentary that talks about obesity which is "Supersize Me" that's why I thought that obesity is dangerous than not having exercise. After reading this article it influence me to do more sport and involve in activity because the studies shows that not doing activity has more risk of dying than obesity.