Sore knees after teaching?

Does anyone get a tired, achy feeling in their knees after the first day teaching? We just returned from exams so I’m not used to standing all day anymore. After teaching today my knees feel sore. Does this happen to anyone else? Just curious if it’s normal.

 

My knees are fine. But the end of every first week of school means a sore throat from all the talking

 

What kind of shoes are you wearing?

 

Someone once mentioned Sofft brand in another thread... that person helped me out so much.

 

Yep, It really bothers me during testing season. ( You can't ever sit.) My voice gets sore too during the 1st few weeks and even lately.