People work out, they stress their body, and their body gets stronger from stress.
Hard work will get you a professorship or a BMW. You need both work and luck for a Booker, a Nobel or a private jet.
Work hard, not in grunt work, but in chasing such opportunities and maximizing exposure to them. This makes living in big cities invaluable because you increase the odds of serendipitous encounters-you gain exposure to the envelope of serendipity.
The three most harmful addictions are heroin, carbohydrates, and a monthly salary.