Reddit mentions of Iron Ambition: My Life with Cus D'Amato

It is certainly possible for an INFP to develop competence at a martial art; one of my favorite athletes growing up was Mike Tyson; while he was focused and dedicated (ending with the fight vs. Michael Spinks on June 27, 1988) he was very, very good--for over three years head-and-shoulders above anyone else in the world.

That does not mean an INFP who trains at a particular sensing-heavy task or skill becomes "good with sensing"; in the case of Tyson, for example, once he stopped training/drilling constantly (after a serious of personal tragedies lead him into a deep depression, and at the urging of ESTP promoter/enabler/leach Don King, fired his ESFP trainer Kevin Rooney) his skills eroded with stunning swiftness; he was by no means a "natural fighter".

To give another example--in 1984, while preparing for the Olympic trials, Tyson befriended and trained with future opponent ISTJ Evander Holyfield, and Holyfield made a very interesting comment: he mentioned that Mike had remarkable skills on the speed bag, on which he obviously practiced constantly, but that when they played a game of pick-up-basketball--a sensory activity neither of them focused on--he was awful, relative to himself and others, most of whom were presumably SPs and SJs.

When INFPs become accomplished at a sport, or playing an instrument, etc. they tend to operate in a primitive STJ-ish manner; they tend to have and rely on a number of extremely well-grooved but essentially rote movements or sequences or combinations. SP improvisational wizzards they are not. With Tyson, for example, the right-hook to the body followed immediately by an uppercut with the same hand was one such rote combination: https://youtu.be/AMydMkEB97k

If the above interests you, this book about Mike and his ENTJ mentor/adoptive father/first trainer is a great read:

https://www.amazon.com/Iron-Ambition-Life-Cus-DAmato/dp/0399177035

https://www.si.com/boxing/2017/05/30/mike-tyson-cus-damato-iron-ambition-book-excerpt