Exercise you must do to get higher with lift (5,2)
I believe the answer is:
'exercise' is the definition.
(I know that press-up is a type of arm exercise)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for press up that I've seen before include "something to get you fit" , "A little exercise" , "bit of exercise" .)