Check the sole of the foot

I happened to watch the tv program,
'Kenko Capsule', it means for the good treatment to keep healthy.
It was about the sole of the foot which is very important part of the knees and back balance. Soles should have arch curves to protect from the pressure to damage knees or back.
If the arch were badly crashed by some reasons, healthy problems would occur on your knees and back aches.
So you'd better check your soles if they had good arches.