Classy record of what one studied when working out (8,4)
I believe the answer is:
exercise book
'what one studied when working out' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'classy record' is the wordplay.
'classy' becomes 'exercise' (I am not sure about this - if you are sure you should believe this answer much more).
'record' becomes 'book' (book is a kind of record).
'exercise'+'book'='EXERCISE BOOK'
'of' acts as a link.
Can you help me to learn more?
(Another definition for exercise book that I've seen is " School item".)