Just to set the record straight I’m not obese, just over weight according to the BMI chart. Also I’m not really worried about getting cancer (too many other things to worry about). The article does make a lot of sense as the rise in cancer does seem to correspond to the rise in obesity, at least here in the US. Not sure about other countries. I have a mountain bike which is fun to ride, probably a little more dangerous than the treadmill, I did almost fall off once and had not even been drinking.