Mitochondria fuse with one another, forming filaments, and their typical depiction as isolated bean shapes is an oversimplification.

“Yeah. So, and when they fuse, you get these like bean or kidney shapes or peanut shape, whatever your your preference is that fuse with one another and then they form these beautiful filaments. Uh so, if you're lucky enough to work in a lab that has one of these cool microscopes called conffocal microscope or light sheet microscopy and then you can make the mitochondria fluorescent. So you put a dye in in the dish and then it's a little fluorescent molecule that it goes inside the mitochondria. It's attracted by the big uh charge that mitochondria have uh and then you turn off the lights, look down the eyepiece and then you see this beautiful like filaments, you know, mitochondria moving. They move pretty slowly and interestingly they're just at the edge of human perception of like uh how quickly we can perceive things to move.”