The dweller in cities has less chance than the dweller in the country to keep his body sound and vigorous.
 Theodore Roosevelt, Theodore Roosevelt; an Autobiography (1913). copy citation

Context

“I have mentioned all these experiences, and I could mention scores of others, because out of them grew my philosophy—perhaps they were in part caused by my philosophy—of bodily vigor as a method of getting that vigor of soul without which vigor of the body counts for nothing. The dweller in cities has less chance than the dweller in the country to keep his body sound and vigorous. But he can do so, if only he will take the trouble. Any young lawyer, shopkeeper, or clerk, or shop-assistant can keep himself in good condition if he tries. Some of the best men who have ever served under me in the National Guard and in my regiment were former clerks or floor-walkers.” source