Guardian etc in revolt over introduction of spinning as part of training (5-3)
I believe the answer is:
press-ups
'part of training' is the definition.
'guardian etc in revolt over introduction of spinning' is the wordplay.
'guardian etc' becomes 'press' (newspaper industry).
'in revolt' becomes 'up' (I've seen this in other clues).
'over' means one lot of letters go next to another.
'introduction of' says to take the initial letters.
The first letter of 'spinning' is 's'.
'press'+'up'+'s'='PRESS-UPS'
'as' is the link.
(Other definitions for press-ups that I've seen before include "Exercises done facing the floor" , "Exercises performed face down" .)