I have to tell you that I take very good care of my furs.
However, I know a lot of kitties with long furs have a real problem with clumps developing under the legs, where they connect with the body. When I am lying on my back (picture not shown), Mom takes a soft brush and, starting at the neck, she brushes all the way to the end (where my tail connects). I have never had any clumps anywhere on my body, but it can be a problem for some long-haired kitties in the late Spring (when the weather starts warming up). Some kitties need some combing and scissor snipping here, in addition to the brushing.
A little secret: I am VERY ticklish on my tummy, when Mom brushes me there!!
Next (and final posting on the subject): The worst place to get clumps .