Can we say that someone is doing something on his/her feet if that person is doing it in a standing position. For example, are sentences like the ones below correct?
Everybody clapped the performers on their feet.
I work on my feet the whole day.
I like playing guitar on my feet.
The whole class sang the song on their feet.
I am asking this question because all the examples I found of “on one’s feet” are sentences like “Everyone’s on their feet” which say someone is standing. I couldn’t find a usage in which it is used to mean someone is doing something standing.