Bodyweight exercise (3)
I believe the answer is:
dip
'bodyweight exercise' is the definition.
(I know that dip is a type of bodyweight exercise)
This is the entire clue.
(Other definitions for dip that I've seen before include "Sudden sharp decrease in quantity" , "Sink; thick sauce" , "Immerse briefly in liquid" , "Thick sauce; brief swim" , "Sink downwards" .)