Foot odor (or foot odour) is a type of body odor that affects the feet of humans and is generally considered to be an unpleasant smell.
https://en.wikipedia.org/wiki/Foot_odor
Concept art Smelly feet Bad knees
"We long to be here for a purpose, even though, despite much self-deception, none is evident."
Robot Leg Concept
Concept art Smelly feet Bad knees