In getting healthy, expand the chest (6)
I believe the answer is:
inhale
'expand the chest' is the definition.
I can't tell whether this definition defines the answer.
'in getting healthy' is the wordplay.
'getting' says to put letters next to each other.
'healthy' becomes 'hale' (similar in meaning).
'in'+'hale'='INHALE'
Can you help me to learn more?
(Other definitions for inhale that I've seen before include "Breathe in (gas, smoke)" , "Draw in air or smoke" , "Whiff" , "Draw breath" , "drag" .)