" the trade of physical fitness for money was a pretty good deal."
We barter our time (a finite resource) for money.
Some people's time is more valuable spent in physical exercise, some in mental, some in both.
Some have other sources of wealth and need not barter their time. Perhaps they charitably give it away, or squander it (if you believe we have a moral/spiritual obligation to steward our time).
A blessed man is one who is paid to do what he enjoys.
Or earns enough to allow him to keep more of his time for himself.
Do you believe your time is yours or do you owe another a debt of that time?
That "other" might be God, Spouse, Parent, Child, Sibling, Friend, Community.
That, by the way, is the order of preference as I see it.
How do you divvy it up?
New King James Version (NKJV)
14 What does it profit, my brethren, if someone says he has faith but does not have works? Can faith save him? 15 If a brother or sister is naked and destitute of daily food, 16 and one of you says to them, “Depart in peace, be warmed and filled,” but you do not give them the things which are needed for the body, what does it profit? 17 Thus also faith by itself, if it does not have works, is dead.
18 But someone will say, “You have faith, and I have works.” Show me your faith without your[a]works, and I will show you my faith by my[b] works. 19 You believe that there is one God. You do well. Even the demons believe—and tremble! 20 But do you want to know, O foolish man, that faith without works is dead?[c] 21 Was not Abraham our father justified by works when he offered Isaac his son on the altar? 22 Do you see that faith was working together with his works, and by works faith was made perfect? 23 And the Scripture was fulfilled which says, “Abraham believed God, and it was accounted to him for righteousness.”[d] And he was called the friend of God. 24 You see then that a man is justified by works, and not by faith only.