Exercise to get reporters informed (5,2)
I believe the answer is:
press up
'exercise' is the definition.
(I know that press-up is a type of arm exercise)
'get reporters informed' is the wordplay.
'get' means one lot of letters go next to another.
'reporters' becomes 'press' (members of the press).
'informed' becomes 'up' (being up on a topic means being informed about it).
'press'+'up' is 'PRESS-UP'.
'to' acts as a link.
(Other definitions for press up that I've seen before include "something to get you fit" , "bit of exercise" , "A little exercise" .)