Clue: Entirely pointlessly in June, unfortunately, I just abandoned physical activity (3-5)
Answer: JIU-JITSU
Explanation: Definition: physical activity
 **Anagram of**(…, unfortunately) "in June" **minus**(Entirely pointlessly …) "n,n,e"(abbrev. for 2 x "north" and "east" respectively, compass points) + **anagram of**(… abandoned) I JUST.