I'm struggling with the choice of preposition to use for the following sentence.

  1. Amy enjoys the challenge of doing X,Y,Z to improve her run time.

  2. Amy enjoys the challenge in doing X,Y,Z to improve her run time.

Are they both acceptable?


Though using "in" is possible,

in this context the use of preposition "of" is only acceptable.

Besides it's preferable according to this.

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