There are two ways to interpret: “Only doing hard things produces improvement”.
1) Someone who doesn’t do hard things won’t improve.
2) Someone who does easy things won’t improve.
I haven’t read the book but it would suprise me if the book would claim 2) instead of 1).
There are two ways to interpret: “Only doing hard things produces improvement”. 1) Someone who doesn’t do hard things won’t improve. 2) Someone who does easy things won’t improve.
I haven’t read the book but it would suprise me if the book would claim 2) instead of 1).