Other than quitting a pack-a-day smoking habit, quitting a sedentary lifestyle is the single most effective thing you can do to improve your health. That statement is not opinion, it is scientifically supported fact. There is no other health intervention of any sort that has such strong evidence in reducing all-risk mortality and improving quality of life as daily exercise.
Certain conditions are more ‘fun’ to treat than others. Ask any GP: aspirating an abscess is full of reward and gratification (actually, to be accurate, it’s full of pus). Someone comes in with something incredibly painful and you’ve got a skill that can offer immediate relief. Managing someone’s blood pressure is a much more thankless task.
Other than quitting a pack-a-day smoking habit, regular physical activity is the single most effective thing you can do to reduce your risk of cancer. That statement is not based on opinion it is a quantifiable fact. Exercise is safe in overdose and has a lower side effect profile than any medication we know of. If it was a drug, we’d put it in the water supply. If it was a product it would out-sell smartphones.