Strenuous hike (4)
I believe the answer is:
trek
(Other definitions for trek that I've seen before include "Difficult journey on foot" , "A long arduous walk" , "Extended journey" , "Long and difficult trip" , "Long walk, expedition" .)
I believe the answer is:
trek
(Other definitions for trek that I've seen before include "Difficult journey on foot" , "A long arduous walk" , "Extended journey" , "Long and difficult trip" , "Long walk, expedition" .)