Good day doing exercises, breaks in the routine? (8)
I believe the answer is:
hiatuses
'breaks in the routine?' is the definition.
'hiatuses' can be an answer for 'breaks' (hiatus is a kind of break). I'm not sure about the 'in the routine?' bit.
'good day doing exercises' is the wordplay.
'good day' becomes 'hi'.
'doing' becomes 'at' (I can't explain this - if you can you should believe this answer much more).
'exercises' becomes 'uses' (to exercise something can mean to use it).
'hi'+'at'+'uses'='HIATUSES'
Can you help me to learn more?
(Other definitions for hiatuses that I've seen before include "Openings" , "breaks" , "Gaps in sequence for a Hussite" .)