Funny story. I took my majestic asf cat to the vet last week for her check up. She is a bigger and longer cat than I have ever owned and weighs 16.5 pounds. She is a mix of two long haired breeds I cannot remember which ones though. I ask how my vet about these strange pouchesnof skin she has under her legs. My vet explains that bigger breed cats evolved to have pouches of loose skin under their legs so they can jump from the back legs while reaching up with the front paws and the extra skin helps them reach even farther. That was the gist of it at least, all cats have it but the pouches can be seen easier with longer fur cats I guess. I kinda remember my maine coon having this as well.  This eatbeast may be evolving into a large four legged creature, my guess, a couch bison. She won't need the arm pouches for leaping, but rather for reachinf cheetos that are extra far away.