Hello Zombie:
<<Whenever I talk to people about martial arts, (I do this a lot)
Long as you are ~soft spoken~ about it I guess... a lot of silly people seek/want to physically do something to/with ~karottty guys~... (sic martial arts people)

Fear of hurting themselves...

Fear of BEING hurt...

Fear they will need to become a "monk"

or required to "convert" to some belief/religon/philosophy something unnamed and insidious...
Fear they will never get anywhere with it, (ie it will take more than 60 seconds...)
Fear they cannot "be themselves" in the uniforms (ie no fashion, jewelry, shoes, nothing external to make them "special"

)
Fear they will be required to remove their nails

Fear they will have to fight guys (ie they being tiny, everyone else far larger, heavier, angrier than themselves)
Fear they will explore their anger...

Fear it will take them away from their few minutes of "family time" they now have per week...

Fear it will cost too much (eg "...the place down the street cost my buddy $1,200 for the full year contract...")

There are lots of amusing, odd, bizarre fears...
Jeff