Gym membership in Seoul for Foreigners?

Hi, wondering if anyone is running into this issue but haven't seen it in my reddit searches yet.

I tried 2 different gyms near the SNU station -- SpoAny and Gymboxx, since they're within my budget. I'm looking for a gym for 3 months. but SpoAny's registration required me to have a korean ARC, gymboxx wouldn't let me pay for the month without a korean bank account (but when I borrowed my Korean friends account it still didn't work).

any foreigners have any idea how I can get a 3 mo. (or even 1 mo.) membership at any gym near SNU station? not trying to go all the way to campus for gym since I only go to campus like 2x a week. any help is much appreciated. (oh and if anyone knows where I can find a blender bottle too that would be much appreciated)