muscles, muscle tone ,more muscles more toning im begininng to wonder how much ferreting you have done a larger cage helps a ferret keep active thats about it it wont condition its self for working constant work gets ferrets fit, large kennel runs dont get greyhounds fit or they would be in massive runs
i have 9 ferrets in a 18x10 ft shed with a large run with loads of different heights for them to climb and run about ,they are kept very fit with all the space i would say thats huge for ferret space.you wouldnt keep a dog in a small space all summer and then expect it to be fit enough for