Personally I would say yes ... anything that shows:
- Ability to focus / learn new skills
- Dedication
- ...
Personally I include, as hobbies:
- Sailing (Royal Yachting Association Yachtmaster Offshore)
- Flying (Commercial Pilots Licence, Flying Instructor, Gliding Silver 'C')
- Diving (PADI Rescue Diver)
All of which show focus over several years.
OC619
P.S. For you CV don't trust spell checker to catch everything ... "recon"