Free masks possibly included with obviously muscular physique (6)
I believe the answer is:
ripped
'with obviously muscular physique' is the definition.
(ripped can mean visibly muscular)
'free masks possibly included' is the wordplay.
'free' becomes 'rid' (similar in meaning).
'masks possibly' becomes 'ppe' (type of personal protective equipment).
'included' is an insertion indicator.
'rid' going around 'ppe' is 'RIPPED'.
(Other definitions for ripped that I've seen before include "Tore roughly apart" , "Tore; torn" , "Torn - rent" , "Copied (CD) to computer" , "Torn, split" .)