How are you?
Thank you for your time.
I have a question.
"They went back and forth taking turns napping."
In this sentence, I think 'in' was deleted to become casual.
The original sentence is 'in taking turns napping', isn't it?
Because preposition 'in' has meaning 'as' or 'simultaneously'.
I just want to analyse this sentence.
I'm looking forward to your comment.
Thabk you very much.
Have a great day.