Judges and journalists lay on their backs and lift weights (5,5)
I believe the answer is:
bench press
'lay on their backs and lift weights' is the definition.
I can't judge whether this definition defines the answer.
'judges and journalists' is the wordplay.
'judges' becomes 'bench' (name for a judge's seat, or for judges themselves).
'and' means one lot of letters go next to another.
'journalists' becomes 'press' (the press can mean the newspaper industry).
'bench'+'press'='BENCH-PRESS'
Can you help me to learn more?
(Other definitions for bench press that I've seen before include "lift" , "Weighty exercise" , "Show of strength" .)