Do exercises for a while (7)
I believe the answer is:
stretch
This could be a double definition.
'do exercises' is the first definition.
'stretch' can be an answer for 'do' (thesaurus). I am not sure about the 'exercises' bit.
'a while' is the second definition.
(thesaurus)
'for' is the link.
Can you help me to learn more?
(Other definitions for stretch that I've seen before include "Term of imprisonment" , "What one does in prison" , "Period of time in prison" , "extended" , "Exaggerate" .)